Multi-stage Water Filter System in Fort St. John
Water described as "hard" has high levels of dissolved minerals, especially calcium and magnesium. Over time, hard water can shorten the life of your home appliances, hot water heaters, boilers, etc. As water moves through soil and rock, it dissolves small amounts of minerals and holds them in solution. Calcium and magnesium dissolve in water and are the two most common minerals that make water "hard." The degree of hardness becomes greater as the calcium and magnesium content increases. If you’re facing hard water issues in Fort St. John, we can help with our superior water filter system solutions.
Water Standards Q&A
All of the below water quality issues are correctable by Clear Blue Water Systems Ltd.’s treatment systems and components. For outside our service areas, we will bed and ship any required water filter ready to use to your location. Click through the topics below to jump to a certain topic.
Hard water might be suitable for drinking because of minerals, but it can be highly harmful to your pipes and appliances, causing extensive damage. Let’s understand the benefits a water softener offers:
Healthier skin and overall well-being: By removing the damaging minerals in hard water, a water softener can help you maintain healthy and clear skin.
Shiny, strong hair: The hard minerals in water can be extremely damaging to your hair. By removing impurities and suspended particles, your water purifier can help you maintain shiny and strong hair.
Removes any unwanted taste:suspended particles can cause your water to taste peculiar. A water softening system can help in making your water taste-neutral while removing any unwanted tastes and smells.
Soft water Is easier on your pipes and appliances: water softener also helps in keeping your pipes and drains clean. Impurities in the water can accumulate and deposit on the surface of your pipes.
Call us to get more information on our high-quality water purification systems in Fort St. John.
Hard water is not generally harmful, but a nuisance because of mineral build-up on fixtures and poor soap and/or detergent performance. Do you see any of these problems with your water?
White clothes are now grey or dingy
White build-up on the sink and bath fixtures from calcium
Reduced water pressure
Dry or itchy skin
Constantly cleaning up soap scum
Appliances wearing out too quickly
Solve Hard Water Issues With a Clear Blue Water Systems Ltd. Softener
Water softeners are used in water treatment to remove calcium and magnesium to create soft water, prevent calcium or scale build-up, resolve hair and skin issues, and make soaps more efficient. A water softener is an investment that can help you save money and reduce your stress.
Source of Acidic Water: Acidic waters usually attain their acidity from the seepage of acid mine waters or acidic industrial wastes. Acid mine waters are frequently too low in pH to provide suitable drinking water even after neutralization and treatment.
Treatment of Acidic Water: Acidic water can be corrected by injecting soda ash or caustic soda (sodium hydroxide) into the water supply to raise the pH. The utilization of these two chemicals slightly increases the alkalinity in direct proportion to the amount used. Acidic water can also be neutralized up to a point by running it through calcite, corosex or a combination of the two. The calcite and the corosex both neutralize by dissolving, and they add hardness to the water as the neutralization takes place; therefore, they both need to be replenished on a periodic basis.
Source of Aluminum: Aluminum (Al+3) is an abundant metal on the Earth's surface, but its solubility in water is so low that it is seldom a concern in municipal or industrial water systems. The majority of natural water contains from 0.1 ppm up to 9.0 ppm of aluminum; however, the primary source of aluminum in drinking water comes from the use of aluminum sulphate (alum) as a coagulant in water treatment plants. The total dietary exposure to aluminum salts averages around 20 mg/day. Per the Canadian Drinking Water Standards, the maximum allowable limit of aluminum is 0.1 mg/l.
Treatment of Aluminum: Aluminum can be removed from water by a cation exchanger, but hydrochloric acid or sulfuric acid must be used for regeneration to remove the aluminum from the resin. While this is suitable for an industrial application, it is not recommended for domestic use unless it is in the form of a cation exchange tank. Reverse osmosis will reduce the aluminum content of drinking water by 98%. Distillation will reduce the aluminum content of water by 99%. Electrodialysis is also very effective in the reduction of aluminum.
Source of Ammonia: Ammonia (〖"NH" 〗_3) gas, usually expressed as Nitrogen, is extremely soluble in water. It is the natural product of the decay of organic nitrogen compounds. Ammonia finds its way into surface supplies from the runoff in agricultural areas, where it is applied as fertilizer. It can also find its way to underground aquifers from animal feed lots. Ammonia is oxidized to nitrate by bacterial action. A concentration of 0.1 to 1.0 ppm is typically found in most surface water supplies and is expressed as N. Ammonia is not usually found in well water supplies because the bacteria in the soil convert its nitrates. The concentration of Ammonia is not restricted by drinking water standards. Since Ammonia is corrosive to copper alloys, it is a concern in cooling systems and in boiler feed.
Treatment of Ammonia: Ammonia can be destroyed chemically by chlorination. The initial reaction forms chloramine and must be completely broken down before there is chlorine residual. The chlorine will destroy organic contaminants in the waste stream before reaching ammonia. Ammonia can also be removed by cation exchange resin in the hydrogen form, which is the utilization of acid as a regenerant. Degasification will also remove Ammonia.
Source of Arsenic: Arsenic (As) is not easily dissolved in water; therefore, if it is found in water supply, it usually comes from mining or metallurgical operations or from runoff from agricultural areas where materials containing arsenic were used as industrial poisons. Arsenic and phosphate easily substitute for one another chemically. Therefore commercial-grade phosphate can have some arsenic in it. Arsenic is highly toxic and has been classified by the Canadian Drinking Water Standards as a carcinogen. The current maximum allowable limit for arsenic is 0.01 mg/l, which was derived from toxicity considerations rather than carcinogenicity.
Treatment of Arsenic: If in an inorganic form, arsenic can be removed or reduced by conventional water treatment processes. There are five ways to remove inorganic contaminants; reverse osmosis, activated alumina, ion exchange, activated carbon, and distillation. Filtration through activated carbon will reduce the amount of arsenic in drinking water from 40 - 70%. Anion exchange can reduce it by 90 - 100%. Reverse Osmosis has a 90% removal rate, and Distillation will remove 98%. If the arsenic is present in organic form, it can be removed by oxidation of the organic material and subsequent coagulation.
Source of Bacteria: Bacteria are tiny organisms occurring naturally in water. Not all types of bacteria are harmful. Many organisms found in water are of no health concern since they do not cause disease. Biological contamination may be separated into two groups: (1) pathogenic (disease-causing) and (2) non-pathogenic (not disease-causing). Pathogenic bacteria cause illnesses such as typhoid fever, dysentery, gastroenteritis, infectious hepatitis, and cholera. All water supplies should be tested for biological content prior to use and consumption. E.coli (Escherichia Coli) is the coliform bacterial organism that is looked for when testing the water. This organism is found in the intestines and fecal matter of humans and animals. If E.coli is found in a water supply along with high nitrate and chloride levels, it usually indicates that waste has contaminated the supply from a septic system or sewage dumping and has entered by way of runoff, a fractured well casing, or broken lines. If coliform bacteria are present, it is an indication that disease-causing bacteria may also be present. Four or fewer colonies/100 ml of coliforms, in the absence of high nitrates and chlorides, implies that surface water is entering the water system. The most common non-pathogenic bacteria found in water is iron bacteria. Iron bacteria can be readily identified by the red, feathery floc, which forms overnight at the bottom of a sample bottle containing iron and iron bacteria.
Treatment of Bacteria: Bacteria can be treated by microfiltration, reverse osmosis, ultra-filtration, or chemical oxidation and disinfection. Ultraviolet sterilization will also kill bacteria, but turbidity, colour, and organic impurities interfere with the transmission of ultraviolet energy and may decrease the disinfection efficiency below levels to ensure destruction. Ultraviolet treatment also does not provide residual bactericidal action, therefore periodic flushing and disinfection must be done. Ultraviolet sterilization is usually followed by 0.2-micron filtration when dealing with high-purity water systems. The most common and undisputed method of bacteria destruction is chemical oxidation and disinfection. Ozone injection into a water supply is one form of chemical oxidation and disinfection. A residual of 0.4 mg/l must be established, and a retention time of four minutes is required. Chlorine injection is the most widely recognized method of chemical oxidation and disinfection. Chlorine must be fed at 3 to 5 pm to treat bacteria, and a residual of 0.4 ppm of free chlorine must be maintained for 30 minutes in order to meet Canadian Drinking Water Standards. Reverse Osmosis will remove 99+ % of the bacteria in a drinking water system.
Source of Barium: Barium (〖"Ba" 〗^"+2" ) is a naturally occurring alkaline earth metal. Traces of the element are found in surface and ground waters. It can also be found in oil and gas drilling muds, waste from coal-fired power plants, jet fuels, and automotive paints. Barium is highly toxic when its soluble salts are ingested. The current maximum allowable limit for Barium is 1.0 mg/l.
Treatment of Barium: Sodium form cation exchange units (softeners) are very effective at removing Barium. Reverse Osmosis is also extremely effective in its removal, as well as Electrodialysis.
Source of Benzene: Benzene, a by-product of petroleum refining, is used as an intermediate in the production of synthesized plastics and is also an additive in gasoline. Gasoline contains approximately 0.8 percent benzene by volume. Benzene is classified as a volatile organic chemical (VOC) and is considered a carcinogen by Canadian Drinking Water Standards. Benzene makes its way into water supplies from leaking fuel tanks, industrial chemical waste, pharmaceutical industry waste, or from runoff of pesticides. The current Canadian Drinking Water Standards’ maximum allowable limit for Benzene is 0.005 mg/l.
Treatment of Benzene: Benzene can be removed with activated carbon. Approximately 1000 gallons of water containing 570 ppb of benzene can be treated with 0.35 lbs of activated carbon. In other words, 94,300 gallons of water can be treated for every cubic foot of carbon. The benzene must be in contact with the carbon for a minimum of 10 minutes. If the required flow rate is 5 gpm, then 50 gallons of carbon is required, which converts to approx. 7 cu. ft. The activated carbon must be replaced when exhausted.
Source of Bromine (Bromide): Bromine is found in seawater and exists as the bromide ion at a level of about 65 mg/l. Bromine has been used in swimming pools and cooling towers for disinfection. However, use in drinking water is not recommended. Ethylene bromide is used as an anti-knock additive in gasoline, and methyl bromide is a soil fumigant. Bromine is extremely reactive and corrosive and will produce irritation and burning to exposed tissues. Over 0.05 mg/l in freshwater may indicate the presence of industrial wastes, possibly from the use of pesticides of biocides containing bromine. Bromide is extensively used in the pharmaceutical industry and normally occurs in blood in the range of 1.5 to 50 mg/l.
Treatment of Bromine (Bromide): Reverse Osmosis will remove 93 -96% of the bromide from drinking water. Since bromine is a disinfectant, it along with the disinfection by-products, can also be removed with Activated Carbon, Ultrafiltration, or Electrodialysis.
Source of Borate (Boron): Borate B(〖"OH" 〗_"4" ) is a compound of Boron. Most of the world's boron is contained in seawater. Sodium borate occurs in arid regions where inland seas once existed but have long since evaporated. Boron is frequently present in freshwater supplies in these same areas in the form of non-ionized boric acid. The amount of boric acid is not limited by drinking water standards, but it can be damaging to citrus crops if it is present in irrigation water and becomes concentrated in the soil. Canadian Drinking Water Standards’ maximum allowable limit for Boron is 5.0 mg/l.
Treatment of Borate (Boron): Boron behaves like silica when it is in an aqueous solution. It can be removed with an Anion Exchanger or adsorbed utilizing an Activated Carbon Filter.
Source of Bicarbonate: The Bicarbonate (〖"HCO" 〗_"3" ) ion is the principal alkaline constituent in almost all water supplies. Alkalinity in drinking water supplies seldom exceeds 300 mg/l. Bicarbonate alkalinity is introduced into the water by 〖"CO" 〗_"2" dissolving carbonate-containing minerals. Alkalinity control is important in the boiler feed water, cooling tower water, and the beverage industry. Alkalinity neutralizes the acidity in fruit flavours, and in the textile industry, it interferes with acid dying. Alkalinity is known as a "buffer".
Treatment of Bicarbonate: In the pH range of 5.0 to 8.0 there is a balance between excess 〖"CO" 〗_"2" and bicarbonate ions. Removing the free 〖"CO" 〗_"2" through aeration can reduce the bicarbonate alkalinity. Feeding acid to lower the pH can also reduce the alkalinity. At pH 5.0 there is only 〖"CO" 〗_"2" and 0 alkalinity. A strong base anion exchanger will also remove alkalinity.
Source of Cadmium: Cadmium enters the environment through a variety of industrial operations; it is an impurity found in zinc. By-products from mining, smelting, electroplating, pigment, and plasticizer production can contain cadmium. Cadmium emissions come from fossil fuel use. Cadmium makes its way into the water supplies as a result of the deterioration of galvanized plumbing, industrial waste or fertilizer contamination. Canadian Drinking Water Standards lists Cadmium with a 0.005 mg/l maximum allowable limit.
Treatment of Cadmium: Cadmium can be removed from drinking water with a sodium form cation exchanger (softener). Reverse Osmosis will remove 95 - 98% of the cadmium in the water. Electrodialysis will also remove the majority of the cadmium.
Source of Calcium: Calcium is the major component of hardness in water and is usually in the range of 5 - 500 mg/l, as 〖"CaCO" 〗_"3". Calcium is derived from nearly all rock, but the greatest concentrations come from limestone and gypsum. Calcium ions are the principal cations in most natural waters. Calcium reduction is required in treating cooling tower makeup. Complete removal is required in metal finishing, textile operations, and boiler feed applications.
Treatment of Calcium: Calcium, as with all hardness, can be removed with a simple sodium form cation exchanger (softener). Reverse Osmosis will remove 95 - 98% of the calcium in the water. Electrodialysis and Ultrafiltration also will remove calcium. Calcium can also be removed with the hydrogen from the cation exchanger portion of a deionizer system.
Source of Carbon Dioxide: Free carbon dioxide (〖"CO" 〗_"2" ) exists in varying amounts in most natural water supplies. Most well waters will contain less than 50 ppm. Carbon Dioxide in water yields an acidic condition. Water ("H" _"2" "O" ) plus carbon dioxide (〖"CO" 〗_"2" ) yields carbonic acid ("H" _"2" 〖"CO" 〗_"3" ). The dissociation of carbonic acid yields hydrogen (H) and bicarbonate alkalinity (〖"HCO" 〗_"3" ). The pH value will drop as the concentration of carbon dioxide increases and, conversely, will increase as the bicarbonate alkalinity content increases.
"H" _"2" "O" + 〖"CO" 〗_"2" <====> "H" _"2" 〖"CO" 〗_"3" <====> H+ + 〖"HCO" 〗_"3"
Water with a pH of 3.5 or below generally, contains mineral acids such as sulfuric or hydrochloric acid. Carbon Dioxide can exist in waters with pH values from 3.6 to 8.4 but will never be present in waters having a pH of 8.5 or above. The pH value is not a measurement of the amount of carbon dioxide in the water but rather the relationship between carbon dioxide and bicarbonate alkalinity.
Treatment of Carbon Dioxide: Free 〖"CO" 〗_"2" can be easily dissipated by aeration. A two-column deionizer (consisting of hydrogen form a strong acid cation and a hydroxide form strong base anion) will also remove the carbon dioxide. The cation exchanger adds the hydrogen ion (H+), which shifts the above equation to the left in favour of water and carbon dioxide release. The anion resin removes the carbon dioxide by actually removing the bicarbonate ion. A forced draft degasifier placed between the cation and anion will serve to blow off the 〖"CO" 〗_"2" before it reaches the anion bed, thus reducing the capacity requirements for the anion resin. The 〖"CO" 〗_"2" can be eliminated by raising the pH to 8.5 or above with soda ash or a caustic soda chemical feed system.
Source of Carbon Tetrachloride: Carbon tetrachloride (〖"CC" 〗_"14" ) is a volatile organic chemical (VOC), and is primarily used in the manufacture of chlorofluoromethane but also in grain fumigants, fire extinguishers, solvents, and cleaning agents. Many water supplies across the country have been found to contain measurable amounts of VOCs. VOCs pose a possible health risk because a number of them are probable or known carcinogens. The detection of VOCs in a water supply indicates that a pollution incident has occurred because these chemicals are man-made. See Volatile Organic Chemicals for a complete listing. The Canadian Drinking Water Standards have classified carbon tetrachloride as a probable human carcinogen and established a maximum allowable limit of 0.010 mg/l.
Treatment of Carbon Tetrachloride: Reverse Osmosis will remove 70 to 80% of the VOCs in drinking water, as will ultrafiltration and electrodialysis. Carbon tetrachloride, as well as other volatile organic chemicals (VOCs), can also be removed from drinking water with activated carbon filtration. The adsorption capacity of the carbon will vary with each type of VOC. The carbon manufacturers can run computer projections on many of these chemicals and give an estimate as to the amount of VOC which can be removed before the carbon will need replacement.
Source of Chloride: Chloride (〖"Cl" 〗^"-1" ) is one of the major anions found in water and is generally combined with calcium, magnesium, or sodium. Since almost all chloride salts are highly soluble in water, the chloride content ranges from 10 to 100 mg/l. Seawater contains over 30,000 mg/l of NaC1. Chloride is associated with the corrosion of piping because of the compounds formed with it; for example, magnesium chloride can generate hydrochloric acid when heated. Corrosion rates and the iron dissolved into the water from the piping increase as the sodium chloride content of the water is increased. The chloride ion is instrumental in breaking down passivating films that protect ferrous metals and alloys from corrosion and is one of the main causes of the pitting corrosion of stainless steel. Chloride impacts an objectionable salty taste in drinking water above concentrations of 250 mg/l and may cause corrosion in water distribution systems.
Treatment of Chloride: Reverse Osmosis will remove 90 - 95% of the chlorides because of its salt rejection capabilities. Electrodialysis and distillation are two more processes that can be used to reduce the chloride content of water. A strong base anion exchanger, which is the later portion of a two-column deionizer, does an excellent job at removing chlorides for industrial applications.
Source of Chlorine: Chlorine is the most commonly used agent for the disinfection of water supplies. Chlorine is a strong oxidizing agent capable of reacting with many impurities in water, including ammonia, proteins, amino acids, iron, and manganese. The amount of chlorine required to react with these substances is called the chlorine demand. Liquid chlorine is sodium hypochlorite. Household liquid bleach is 5% sodium hypochlorite. Chlorine in the form of a solid is calcium hypochlorite. When chlorine is added to water, a variety of chloro-compounds are formed. An example of this would be when ammonia is present, inorganic compounds known as chloramines are produced. Chlorine also reacts with residual organic material to produce potentially carcinogenic compounds, the Trihalomethanes (THM's): chloroform, bromodichloromethane, bromoform, and chlorodibromomethane. THM regulations have required that other oxidants and disinfectants be considered in order to minimize THM formation. The other chemical oxidants being examined are: potassium permanganate, hydrogen peroxide, chloramines, chlorine dioxide, and ozone. No matter what form of chlorine is added to water, hypochlorite, hypochlorous acid, and molecular chlorine will be formed. The reaction lowers the pH, thus making the water more corrosive and aggressive to steel and copper pipe.
Treatment of Chlorine: Chlorinated water can be dosed with sulphite-bisulphite-sulphur dioxide or passed through an activated carbon filter. Activated carbon will remove 880,000 ppm of free chlorine per cubic foot of media.
Source of Chromium: Chromium is found in drinking water as a result of industrial waste contamination. The occurrence of excess chromium is relatively infrequent. Proper tests must be run on the water supply to determine the form of the chromium present. Trivalent chromium (〖"Cr" 〗^"-3" ) is slightly soluble in water and is considered essential in man and animals for efficient lipid, glucose, and protein metabolism. Hexavalent chromium (〖"Cr" 〗^"-6" ), on the other hand, is considered toxic. The Canadian Drinking Water Standards classify chromium as a human carcinogen and has max allowable content .05 mg/l.
Treatment of Chromium: Trivalent chromium (〖"Cr" 〗^"-3" ) can be removed with strong acid cation resin regenerated with hydrochloric acid. Hexavalent chromium (〖"Cr" 〗^"-6" ), on the other hand, requires the utilization of a strong base anion exchanger, which must be regenerated with caustic soda (sodium hydroxide) NaOH. Reverse Osmosis can effectively reduce both forms of chromium by 90 to 97%. Distillation will also reduce chromium.
Source of Colour: Colour in water is almost always due to organic material, which is usually extracted from decaying vegetation. Colour is common in surface water supplies, while it is virtually non-existent in spring water and deep wells. Colour in water may also be the result of natural metallic ions (iron and manganese). A yellow tint to the water indicates that humic acids are present, referred to as "tannins." A reddish colour would indicate the presence of precipitated iron. Stains on bathroom fixtures and on laundry are often associated with colour also. Reddish-brown ferric hydroxide (iron) will precipitate when the water is exposed to air. Dark brown to black stains are created by manganese. Excess copper can create blue stains.
Treatment of Colour: Colour is removed by chemical feed, retention and filtration. Activated carbon filtration will work most effectively to remove colour in general. Anion scavenger resin will remove tannins but must be preceded by a softener or mixed with fine mesh softener resin. See the headings Iron, Manganese, and Copper for information on their removal or reduction.
Source of Copper: Copper (〖"Cu" 〗^"-3" ) in drinking water can be derived from rock weathering; however, the principal sources are the corrosion of brass and copper piping and the addition of copper salts when treating water supplies for algae control. The body, for proper nutrition, requires copper. Insufficient amounts of copper lead to iron deficiency. However, high doses of copper can cause liver damage or anemia. The taste threshold for copper in drinking water is 1.0 mg/l under the Canadian Drinking Water Standards.
Treatment of Copper: Copper can be reduced or removed with sodium form strong acid cation resin (softener) dependent on the concentration. If the cation resin is regenerated with acid, performance will be enhanced. Reverse osmosis or electrodialysis will remove 97 - 98% of the copper in the water supply. Activated carbon filtration will also remove copper by adsorption.
Source of Cryptosporidium: Cryptosporidium is a protozoan parasite that exists as a round oocyst about 4 to 6 microns in diameter. Oocysts pass through the stomach into the small intestine, where its sporozoites invade the cell lining of the gastrointestinal tract. Symptoms of infection include diarrhea, cramps, nausea, and low-grade fever.
Treatment of Cryptosporidium: Filtration is the most effective treatment for protozoan cysts. Cartridge POU filters rated at 0.5 microns are designed for this purpose.
Source of Cyanide: Cyanide (CN) is extremely toxic and is not commonly found at significant levels in drinking water. Cyanide is normally found in wastewater from metal finishing operations. The maximum allowable content of cyanide is set at 0.2 mg/l by the Canadian Drinking Water Standards.
Treatment of Cyanide: Chlorine feed, retention, and filtration will break down the cyanide. Reverse Osmosis or Electrodialysis will remove 90 - 95% of it.
Source of Fluoride: Fluoride ("F" ^"+" ) is a common constituent of many minerals. Municipal water treatment plants commonly add fluoride to the water for the prevention of tooth decay and maintain a level of 1.5 - 2.5 mg/l. Concentrations above 5 mg/l are detrimental to the tooth structure. High concentrations are contained in wastewater from the manufacture of glass and steel, as well as from foundry operations. Organic fluorine is present in vegetables, fruits, and nuts. Inorganic fluorine, under the name of sodium fluoride, is a waste product of aluminum and is used in some rat poisons. Canadian Drinking Water Standards for fluoride are 1.5 mg/l maximum allowable limits.
Treatment of Fluoride: Fluoride can be reduced by anion exchange. Adsorption by calcium phosphate, magnesium hydroxide or activated carbon will also reduce the fluoride content of drinking water. Reverse osmosis will remove 93 - 95% of the fluoride.
Source of Giardia Lamblia: Giardia is a protozoan that can exist as a trophozoite, usually 9 to 21 tm long, or as an ovoid cyst, approximately 10 um long and 6 um wide. Protozoans are unicellular and colourless organisms that lack a cell wall. When Giardia are ingested by humans, symptoms include diarrhea, fatigue, and cramps.
Treatment of Giardia Lamblia: Slow sand filtration or a diatomaceous earth filter can remove up to 99% of the cysts when proper pretreatment is utilized. Chemical, ultrafiltration, and reverse osmosis all effectively remove Giardia cysts. Ozone appears to be very effective against cysts when utilized in the chemical oxidation-disinfection process instead of chlorine. The most economical and widely used method of removing Giardia is mechanical filtration. Because of the size of the parasite, it can easily be removed with precoat, solid block carbon, ceramic, pleated membrane, and spun-wrapped filter cartridges.
Calcium Carbonate (〖"CaCO" 〗_"3" ) - Known as limestone, rare in water supplies. Causes alkalinity in water.
Calcium Bicarbonate [Ca(〖HCO〗_3 )_2] - Forms when water containing CO2 comes in contact with limestone. Also causes alkalinity in water. When heated, CO2 is released, and the calcium bicarbonate reverts back to calcium carbonate, thus forming a scale.
Magnesium Bicarbonate [Mg(〖HCO〗_3 )_2] - Similar to calcium bicarbonate in its properties.
Source of Hardness: Hard water is found in over 80% of Canadian water. The hardness of a water supply is determined by the content of calcium and magnesium salts. Calcium and magnesium combine with bicarbonates, sulphates, chlorides, and nitrates to form these salts. The standard domestic measurement for hardness is grains per gallon (gpg) as 〖"CaCO" 〗_"3". Water having a hardness content of less than 0.6 gpg is considered commercially soft. The calcium and magnesium salts which form hardness are divided into two categories: 1) Temporary Hardness (containing carbonates), and 2) Permanent Hardness (containing non-carbonates). Below find listings of the various combinations of permanent and temporary hardness along with their chemical formula and some information on each.
Temporary Hardness Salts
Permanent Hardness Salts
Calcium Sulphate (〖"CaSO" 〗_"4" ) - Known as gypsum, used to make plaster of paris. Will precipitate and form scale in boilers when concentrated.
Calcium Chloride (〖"CaCl" 〗_"2" ) - Reacts in boiler water to produce a low pH as follows: CaC1 + 2HOH ==> Ca〖"(OH)" 〗_"2" + 2HC1
Magnesium Sulphate (〖"MgSO" 〗_"4" ) - Commonly known as Epsom salts, may have a laxative effect if great enough quantity is in the water.
Magnesium Chloride (〖"MgCl" 〗_"2" ) - Similar in properties to calcium chloride.
Sodium salts are also found in household water supplies, but they are considered harmless as long as they do not exist in large quantities.
Treatment of Hardness: Softeners can remove compensated hardness up to a practical limit of 100 gpg. If the hardness is above 30 gpg or the sodium-to-hardness ratio is greater than 33%, then economy salt settings cannot be used. If the hardness is high, then the sodium will be high after softening and may require that reverse osmosis be used for producing drinking water.
Source of Hydrogen Sulfide: Hydrogen Sulfide ("H" _"2" "S" ) is a gas that imparts its "rotten egg" odour to water supplies. Such waters are distasteful for drinking purposes and processes in practically all industries. Most sulphur waters contain from 1 to 5 ppm of hydrogen sulphide. Hydrogen sulphide can interfere with readings obtained from water samples. It turns hardness and pH tests gray and makes iron tests inaccurate. Chlorine bleach should be added to eliminate the "H" _"2" "S" odour; then the hardness, pH and iron tests can be done. Hydrogen sulphide cannot be tested in a lab; it must be done in the field. Hydrogen sulphide is corrosive to plumbing fixtures even at low concentrations. "H" _"2" "S" fumes will blacken or darken painted surfaces, giving them a "smoked" appearance.
Treatment of Hydrogen Sulfide: H2S requires chlorine to be fed in sufficient quantities to eliminate it while leaving a residual in the water (3 ppm of chlorine is required for each ppm of hydrogen sulphide). Activated carbon filtration may then be installed to remove the excess chlorine. A second option is a manganese greensand filter to remove the "H" _"2" "S".
Source of Lead: Lead (Pb2) found in freshwater usually indicates contamination from metallurgical wastes or from lead-containing industrial poisons. Lead in drinking water is primarily from the corrosion of the lead solder used to put together the copper piping. Lead in the body can cause serious damage to the brain, kidneys, nervous system, and red blood cells. The Canadian Drinking Water Standards consider lead to be a highly toxic metal and a major health threat. The current level of lead allowable in drinking water is 0.01 mg/L.
Treatment of Lead: Lead can be reduced considerably with a water softener. Activated carbon filtration can also reduce the lead to a certain extent. Reverse osmosis can remove 94 to 98% of the lead in drinking water at the point of use. Distillation will also remove the lead from drinking water.
Source of Legionella: In July 1976, there was an outbreak of pneumonia affecting 221 people attending the annual Pennsylvania American Legion convention at the Bellevue-Stratford Hotel in Philadelphia. Out of the 221 people infected, 34 died. It wasn't until December 1977 that microbiologists were able to isolate a bacterium from the autopsy of the lung tissue of one of the legionnaires. The bacterium was named "Legionella pneumophila" (Legionella in honour of the American Legion and pneumophila, which is Greek for "lung-loving") and was found to be completely different from other bacteria. Unlike patients with other pneumonias, patients with legionnaire's disease often have severe gastrointestinal symptoms, including diarrhea, nausea, and vomiting. The maximum allowable content of Legionella is 0 mg/L.
Treatment of Legionella: Chemical oxidation-disinfection followed by retention, then filtration could be used. Since Legionella is a bacteria, Reverse osmosis or Ultrafiltration are the preferred removal techniques.
Source of Magnesium: Magnesium (Mg+2) hardness is usually approximately 33% of the total hardness of a particular water supply. Magnesium is found in many minerals, including dolomite, magnesite, and many types of clay. It is in abundance in seawater, where its concentration is five (5) times the amount of calcium. Magnesium carbonate is seldom a major component of scale. However, it must be removed along with calcium where soft water is required for boiler make-up or for process applications.
Treatment of Magnesium: Magnesium may be reduced to less than 1 mg/l with the use of a softener or cation exchanger in the hydrogen form. Also, see "Hardness."
Source of Manganese: Manganese (Mn+4, Mn+2) is present in many soils and sediments as well as in rocks whose structures have been changed by heat and pressure. It is used in the manufacture of steel to improve corrosion resistance and hardness. Manganese is considered essential to plant and animal life and can be derived from such foods as corn, spinach, and whole wheat products. It is known to be important in building strong bones and may be beneficial to the cardiovascular system. Manganese may be found in deep well waters at concentrations as high as 2 - 3 mg/l. It is hard to treat because of the complexes it can form, which are dependent on the oxidation state, pH, bicarbonate-carbonate-OH ratios, and the presence of other minerals, particularly iron. Concentrations higher than 0.05 mg/l cause manganese deposits and staining of clothing and plumbing fixtures. The stains are dark brown to black in nature. The use of chlorine bleach in the laundry will cause the stains to set. The chemistry of manganese in water is similar to that of iron. A high level of manganese in the water produces an unpleasant odour and taste. Organic materials can tie up manganese in the same manner as they do iron; therefore destruction of the organic matter is a necessary part of manganese removal. The Canadian Drinking Water Standards’ maximum allowable content is 0.05 mg/L.
Treatment of Manganese: Removal of manganese can be done by ion exchange (sodium form cation - softener) or chemical oxidation - retention - filtration. Removal with a water softener dictates that the pH be 6.8 or higher, and it is beneficial to use countercurrent regeneration with brine makeup and backwash utilizing soft water. It takes 1 ppm of oxygen to treat 1.5 ppm of manganese. Greensand filters with potassium will remove up to 10 ppm if pH is above 8.0. Birm filter with air injection will reduce manganese if the pH is 8.0 to 8.5. Chemical feed (chlorine, potassium permanganate, or hydrogen peroxide) followed by 20 minutes of retention and then filtered with birm, greensand, carbon, or Filter Ag will also remove the manganese.
Source of Mercury: Mercury (Hg) is one of the least abundant elements in the earth's crust. It exists in two forms, an inorganic salt or an organic compound (methyl mercury). Mercury detected in drinking water is of the inorganic type. Organic mercury enters the food chain through fish and comes primarily from industrial chemical manufacturing waste or from the leaching of coal ash. If inorganic mercury enters the body, it usually settles in the kidneys, whereas organic mercury attacks the central nervous system. As mercury is toxic, the maximum allowable content has been set at 0.001 mg/L by the Canadian Drinking Water Standards.
Treatment of Mercury: Activated carbon filtration is very effective for the removal of mercury. Reverse osmosis will remove 95 - 97% of it.
Source of Methane: Methane (CH_4), often called marsh gas, is the primary component of natural gas. It is commonly found where landfills once existed and are generated from the decaying of plants or other carbon-based matter. It can also be found in and around oil fields. Methane is colourless, odourless, nearly invisible, highly flammable, and often found in conjunction with other gases such as hydrogen sulphide. Even though methane gas gives water a milky appearance which makes it aesthetically unpleasant, there are no known health effects.
Treatment of Methane: Aeration or degasification is the only way to eliminate the problem of methane gas. Venting the casing and/or the cap of the well will reduce the problem of methane in the water but may not completely eliminate it. Another method is to provide an atmospheric holding tank where the methane-laden water can be vented to allow the gas to dissipate. This method may not be 100% effective either. An aerator or degasifier is the proper piece of equipment to utilize for the removal of methane. Water is introduced through the top, sometimes through spray nozzles, and allowed to percolate through a packing material. Air is forced in the opposite direction to the water flow. The water is then collected at the bottom of the unit and repressed.
Source of Nickel: Nickel (Ni+2) is common, exists in approximately 85% of the water supplies, and is usually around 1 ppb (part per billion).
Treatment of Nickel: Nickel behaves the same as iron and can be removed by a strong acid cation exchanger. Activated carbon filtration can be used to reduce the amount of nickel in drinking water but may not remove it all. Reverse osmosis will remove 97 - 98% of the nickel from drinking water.
Source of Nitrate: Nitrate (NO_3) comes into water supplies through the nitrogen cycle rather than via dissolved minerals. It is one of the major ions in natural waters. Most nitrate that occurs in drinking water is the result of contamination of groundwater supplies by septic systems, feed lots and agricultural fertilizers. Nitrate is reduced to nitrite in the body. The Canadian Drinking Water Standards MCL for nitrate is 10 mg/L.
Treatment of Nitrate: Reverse Osmosis will remove 92 - 95% of the nitrates and/or nitrites. Anion exchange resin will also remove both, as will distillation.
Source of Nitrite: Nitrites are not usually found in drinking water supplies at concentrations above 1 or 2 mg/l (ppm). Nitrates are reduced to nitrites in the saliva of the mouth and upper GI tract. This occurs to a much greater degree in infants than in adults because of the higher alkaline conditions in their GI tract. The nitrite then oxidizes hemoglobin in the bloodstream to methemoglobin, thus limiting the ability of the blood to carry oxygen throughout the body. Anoxia (an insufficiency of oxygen) and death can occur. The Canadian Drinking Water Standards have established the MCL (maximum contaminant level) for nitrite at 1 mg/L.
Treatment of Nitrite: Nitrites are removed in the same manner as nitrates; reverse osmosis, anion exchange, or distillation. See Nitrate – Treatment of Nitrate.
Source of Odour: Taste and odour problems of many different types can be encountered in drinking water. Troublesome compounds may result from biological growth or industrial activities. The tastes and odours may be produced in the water supply, in the water treatment plant from reactions with treatment chemicals, in the distribution system, and/or in the plumbing of consumers. Tastes and odours can be caused by mineral contaminants in the water, such as the "salty" taste of water when chlorides are 500 mg/l or above or the rotten egg odour caused by hydrogen sulphide. odour in the drinking water is usually caused by blue-green algae. Moderate concentrations of algae in the water can cause it to have a grassy, musty or spicy odour. Large quantities can cause the water to have a rotten, septic, fishy or medicinal odour. Decaying vegetation is probably the most common cause of taste and odour in surface water supplies. In treated water supplies, chlorine can react with organics and cause odour problems. The contaminant effects are strictly aesthetic, and a suggested Threshold odour Number (TON) of 3 is recommended.
Treatment of odour: odour can be removed by oxidation-reduction or by activated carbon adsorption. Aeration can be utilized if the contaminant is in the form of a gas, such as H_2S (hydrogen sulphide). Chlorine is the most common oxidant used in water treatment but is only partially effective on taste and odour. Potassium permanganate and oxygen are also only partially effective. Chloramines are not at all effective for the treatment of taste and odour. The most effective oxidizers for treating taste and odour are chlorine dioxide and ozone. Activated carbon has an excellent history of success in treating taste and odour problems. The life of the carbon depends on the presence of organics competing for sites and the concentration of the odour-causing compound.
Source of Organics: Organic matter makes up a significant part of the soil; therefore, water-soluble organic compounds are present in all water supplies. Organic matter is reported on a water analysis as carbon, as it is in the TOC (total organic carbon) determination. The following is a list of organics.
Endrin Trichloroethane Lindane
Methoxychlor Vydate Toxaphene
Simazine Polynuclear aromatic hydrocarbons (PAH)
TP Polychlorinated biphenyls (PCB)
Aldicarb Atrazine Chlordane
Ethylene dibromide (EDB)
Organics come from three major sources: (1) the breakdown of naturally occurring organic materials, (2) domestic and commercial chemical wastes, and (3) chemical reactions that occur during water treatment processes. The first Source consists of humic materials, microorganisms, and petroleum-based aliphatic and aromatic hydrocarbons. Organics derived from domestic and commercial chemical wastes include wastewater discharges, agricultural runoff, urban runoff, and leaching from contaminated soils. Organic contaminants comprising the third source, which are formed during water treatment, include disinfection by-products such as THMs (Trihalomethanes) or undesirable components of piping assembly such as joint adhesives.
Treatment of Organics: Activated carbon is generally used to remove organics, colour, and taste-and-odour-causing compounds. The contact time and service flow rate dictate the size of the carbon filter. When removing organics, restrict flow rates to 2 gpm per square foot of the filter bed. Reverse osmosis will remove 98 to 99% of the organics in the water. Ultrafiltration (UF) and nanofiltration (NF) have both been proven to remove organics. Anion exchange resin also retains organics but periodically needs cleaning.
Source of Pesticides: Pesticides are common synthetic organic chemicals (SOCs). Pesticides reach the surface, and well water supplies from the runoff in agricultural areas where they are used. Certain pesticides are banned by the government because of their toxicity to humans or their adverse effect on the environment. Pesticides usually decompose and break down as they perform their intended function. Low levels of pesticides are found where complete breakdown does not occur. There are no Canadian Drinking Water Standards maximum contamination level (MCL) for pesticides as a total; each substance is considered separately.
Treatment of Pesticides: Activated carbon filtration is the most effective way to remove organics, whether synthetic (like pesticides) or natural. Ultrafiltration will also remove organic compounds. Reverse Osmosis will remove 97 - 99% of the pesticides.
Source of pH: The term "pH" is used to indicate the acidity or alkalinity of a given solution. It is not a measure of the quantity of acid or alkali but rather a measure of the relationship of the acid to the alkali. The pH value of a solution describes its hydrogen-ion activity. The pH scale ranges between 0 and 14. Typically all-natural waters fall within the range of 6.0 to 8.0 pH. A value of 7.0 is considered to be a neutral pH. Values below 7.0 are acidic, and values above 7.0 are alkaline. The pH value of water will decrease as the content of CO_2 increases and will increase as the content of bicarbonate alkalinity increases. The ratio of carbon dioxide and bicarbonate alkalinity (within the range of 3.6 to 8.4) is an indication of the pH value of the water. Water with a pH value of 3.5 or below generally contains mineral acids such as sulfuric or hydrochloric acid.
Treatment of pH: The pH can be raised by feeding sodium hydroxide (caustic soda), sodium carbonate (soda ash), sodium bicarbonate, potassium hydroxide, etc., into the water stream. A neutralizing filter containing Calcite (calcium carbonate - CaCO3) and/or Corosex (magnesium oxide - MgO) will combat low pH problems if within the range of 5 to 6. The peak flow rate of a neutralizing filter is 6 gpm/sq. ft. Downflow filters require frequent backwashing to prevent "cementing of the bed." A 50 - 50 mix of the two seems to provide the best all-around results. Upflow neutralizers don't experience the problem of "cementing" the bed.
Source of Potassium: Potassium (K^+) is an alkaline metal closely related to sodium. It is seldom that one sees it analyzed separately on water analysis. Potassium is not a major component in public or industrial water supplies. Potassium is, however, essential in a well-balanced diet and can be found in fruits such as bananas.
Treatment of Potassium: A cation exchange resin, usually in the form of a softener, can remove Potassium. It can also be reduced by 94 - 97% by utilizing electrodialysis or reverse osmosis.
Source of Radium: Radium (Ra) is a radioactive chemical element that can be found in very small amounts in pitchblende and other uranium minerals. It is used in the treatment of cancer and some skin diseases. Radium 226 and radium 228 are of most concern when found in drinking water because of their effects on the health of individuals. Radium 228 causes bone sarcomas. Radium 226 induces carcinomas in the head. Radioactivity in water can be naturally occurring or can be from man-made contamination. Radiation is generally measured in curies (Ci). One curie equals 3.7 x 1010 nuclear transformations per second. A picocurie (pCi) equals 10-12 curies.
Treatment of Radium: Radium can be removed by sodium for cation exchange resin in the form of a water softener. Reverse osmosis will remove 95 - 98% of any radioactivity in the drinking water.
Source of Radon: Radon (Rn) is a radioactive gaseous chemical element formed in the atomic disintegration of radium. Radon 222 is one of the radionuclides of most concern when found in drinking water. It is a naturally occurring isotope but can also come from man-made sources. All radionuclides are considered carcinogens, but the organs they target vary. Since radon 222 is gas, it can be inhaled during showers or while washing dishes. There is a direct relationship between radon 222 and lung cancer. Consult the Canadian Drinking Water Guidelines – Radiological Parameters for information on radon in water.
Treatment of Radon: Radon is easily removed by aeration since it is a gas. Carbon filtration is also very effective in removing radon.
Source of Selenium: Selenium (Se) is essential for human nutrition, with the majority coming from food. The concentration found in drinking water is usually low and comes from natural minerals. Selenium is also a by-product of copper mining/smelting. It is used in photoelectric devices because its electrical conductivity varies with the light. Naturally occurring selenium compounds have not been shown to be carcinogenic in animals. However, acute toxicity caused by high selenium intake has been observed in laboratory animals and in animals grazing in areas where high selenium levels exist in the soil. The Canadian Drinking Water Standards have established the MCL for selenium at 0.05 mg/l.
Treatment of Selenium: Anion exchange can reduce the amount of selenium in drinking water by 60 - 95%. Reverse osmosis is excellent at the reduction of selenium.
Source of Silica: Silica (SiO_2) is an oxide of silicon and is present in almost all minerals. It is found in surface and well water in the range of 1 - 100 mg/l. Silica is considered to be colloidal in nature because of the way it reacts with adsorbents. A colloid is a gelatinous substance made up of non-diffusible particles that remain suspended in a fluid medium. Silica is objectionable in cooling tower makeup and boiler feedwater. Silica evaporates in a boiler at high temperatures and then redeposits on the turbine blades. These deposits must be periodically removed, or damage to the turbine will occur.
Treatment of Silica: The anion exchange portion of the demineralization process can remove silica. Reverse osmosis will reject 85 - 90% of the silica content in the water.
Source of Silver: Silver (Ag) is a white, precious, metallic chemical element found in natural and finished water supplies. Silver oxide can be used as a disinfectant, but it usually is not. Chronic exposure to silver results in a blue-grey colour of the skin and organs. This is a permanent aesthetic effect. Silver shows no evidence of carcinogenicity. However, ingestion of high quantities of silver may result in argyria, a condition characterized by a blue-grey discolouration of the skin, eyes and mucus membranes.
Treatment of Silver: Silver can be reduced by 98% with distillation, up to 60% with activated carbon filtration, up to 90% with cation exchange or anion exchange (dependent on the pH), or up to 90% with reverse osmosis.
Source of SOCs: Over 1000 SOCs (Synthetic Organic Chemicals) have been detected in drinking water at one time or another. Most are of no concern, but some are potentially a health risk to consumers. Below is a list of synthetic organic chemicals along with the proposed MCL (maximum contamination level) in mg/l.
Synthetic Organic Chemicals (Proposed MCL, mg/l)
Aldicarb sulfoxide (0.01)
Aldicarb sulfone (0.04)
Heptachlor epoxide (0.0002)
Polychlorinated biphenyls (0.0005)
Treatment of SOCs: Activated carbon is generally used to remove organics. Flow rates should be restricted to 2 gpm per square foot of the filter bed. Reverse Osmosis will remove 98 to 99% of the organics in the water. Ultrafiltration (UF) and nanofiltration (NF) both will remove organics. Anion exchange resin also retains organics but periodically needs cleaning.
Source of Sodium: Sodium (Na) is a major component in drinking water. All water supplies contain some sodium. The amount is dependent on local soil conditions. The higher the sodium content of water, the more corrosive the water becomes. A major source of sodium in natural waters is from the weathering of feldspars, evaporates and clay. Intake from food is generally the major source of sodium, ranging from 1100 to 3300 mg/day. Persons requiring restrictions on salt intake usually have a sodium limitation down to 500 mg/day. The amount of sodium obtained from drinking softened water is insignificant compared to the sodium ingested in the normal human diet. The amount of sodium contained in a quart of softened, 18-grain per gallon water is equivalent to a normal slice of white bread. Sodium in the body regulates the osmotic pressure of the blood plasma to ensure the proper blood volume. Sodium chloride is essential in the formation of the stomach acids necessary for the digestive processes. The Canadian Drinking Water Standards’ maximum allowable limit for sodium is 200 mg/L.
Treatment of Sodium: Sodium can be removed with the hydrogen form cation exchanger portion of a deionizer. Reverse Osmosis will reduce sodium by 94 - 98%. Distillation will also remove sodium.
Source of Strontium: Strontium (Sr) is in the same family as calcium and magnesium and is one of the polyvalent earth metals that shows up as hardness in water. The presence of strontium is usually restricted to areas where there are lead ores, and its concentration in water is usually very low. Strontium sulphate is a critical reverse osmosis membrane fouling, dependent on its concentration.
Treatment of Strontium: Strontium can be removed with strong acid cation exchange resin. It can be in sodium form, as in a water softener, or hydrogen form, as in the cation portion of a two-column deionizer. Reverse osmosis will also reduce strontium, but as stated above, strontium sulphate is a membrane foulant.
Source of Sulphate: Sulphate (SO_4) occurs in almost all natural water. Most sulphate compounds originate from the oxidation of sulphite ores, the presence of shales, and the existence of industrial wastes. Sulphate is one of the major dissolved constituents in the rain. High concentrations of sulphate in drinking water cause a laxative effect when combined with calcium and magnesium, the two most common components of hardness. Bacteria, which attack and reduce sulphates, cause hydrogen sulphide gas (H_2 S) to form. The Canadian Drinking Water Standards’ maximum allowable limit is 500 mg/L.
Treatment of Sulphate: Reverse osmosis will reduce the sulphate content by 97 - 98%. sulphates can also be reduced with a strong base anion exchanger, which is normally the last half of a two-column deionizer.
Source of Taste: Generally, individuals have a more acute sense of smell than taste. Taste problems in water come from total dissolved solids (TDS) and the presence of such metals as iron, copper, manganese, or zinc. Magnesium chloride and magnesium bicarbonate are significant in terms of taste. Fluoride may also cause a distinct taste. Taste and odour problems of many different types can be encountered in drinking water. Troublesome compounds may result from biological growth or industrial activities. The tastes and odours may be produced in the water supply, in the water treatment plant from reactions with treatment chemicals, in the distribution system, and/or in the plumbing of consumers. Tastes and odours can be caused by mineral contaminants in the water, such as the "salty" taste of water when chlorides are 500 mg/l or above. Decaying vegetation is probably the most common cause of taste and odour in surface water supplies. In treated water supplies, chlorine can react with organics and cause taste and odour problems. See "ODOUR" for more information.
Treatment of Taste: Taste and odour can be removed by oxidation-reduction or by activated carbon adsorption. Aeration can be utilized if the contaminant is in the form of a gas, such as H_2 S (hydrogen sulphide). Chlorine is the most common oxidant used in water treatment but is only partially effective on taste and odour. Potassium permanganate and oxygen are also only partially effective. Chloramines are not at all effective for the treatment of taste and odour. The most effective oxidizers for treating taste and odour are chlorine dioxide and ozone. Activated carbon has an excellent history of success in treating taste and odour problems. The life of the carbon depends on the presence of organics competing for sites and the concentration of the taste and odour-causing compound.
Source of THMs: THMs (Trihalomethanes) are produced when chlorine reacts with residual organic compounds. The four common THMs are chloroform, dibromochloromethane, dichlorobromomethane, and bromoform. There have been studies that suggest a connection between chlorination by-products and particularly bladder and possibly colon and rectal cancer. An MCL of 0.10 mg/l for total THMs exists.
Treatment of THMs: Trihalomethanes and other halogenated organics can be reduced by adsorption with an activated carbon filter.
Source of TOC: TOC (Total Organic Carbon) is a measurement to track the overall organic content of water. The organic content of the water will appear on the water analysis as C (carbon). The TOC test is the most common test performed to obtain an indication of the organic content of the water. Nonspecific tests utilized to determine the organic content of water are given below.
BOD- Biochemical oxygen demand - expressed as O_2
CCE- Carbon-chloroform extract - expressed in weight
CAE- Carbon-alcohol extract (performed after CCE)
COD- Chemical oxygen demand - expressed as O_2
Colour- Colour - reported as APHA units
IDOD- Immediate dissolved oxygen demand - expressed as O_2
LOI- Loss of ignition - expressed in weight
TOC- Total organic carbon - expressed as C
The above tests are used to determine the organic content of the water. For more information about different types, see " Organics."
Treatment of TOC: Procedures and suggestions for the reduction of TOC are given under the heading "ORGANICS."
Source of Total Dissolved Solids: Total Dissolved Solids (TDS) consist mainly of carbonates, bicarbonates, chlorides, sulphates, phosphates, nitrates, calcium, magnesium, sodium, potassium, iron, manganese, and few others. They do not include gases, colloids, or sediment. The TDS can be estimated by measuring the specific conductance of the water. Dissolved solids in natural waters range from less than 10 mg/l for the rain to more than 100,000 mg/l for brines. Since TDS is the sum of all materials dissolved in the water, it has many different mineral sources. The chart below indicates the TDS from various sources.
Total Dissolved Solids (mg/l)
Distilled Water (0)
Two-column Deionizer Water(8)
Rain and Snow(10)
Average River in Canada (210)
Brine Well (125,000)
Dead Sea (250,000)
High levels of total dissolved solids can adversely affect industrial applications requiring the use of water such as cooling tower operations, boiler feed water, food and beverage industries, and electronics manufacturers. High levels of chloride and sulphate will accelerate the corrosion of metals. The Canadian Drinking Water Standards have a suggested level of 500 mg/L listed as an aesthetic objective.
Treatment Total Dissolved Solids: TDS reduction is accomplished by reducing the total amount in the water. This is done during the process of deionization or with Reverse Osmosis. Electrodialysis will also reduce TDS. AT higher levels, excessive hardness, unpalatability, mineral deposition and corrosion may occur.
Source of Turbidity: Turbidity is the term given to anything that is suspended in a water supply. It is found in most surface waters but usually doesn't exist in groundwaters except in shallow wells and springs after heavy rains. Turbidity gives the water a cloudy appearance or shows up as dirty sediment. Undissolved materials such as sand, clay, silt or suspended iron contribute to turbidity. Turbidity can cause the staining of sinks and fixtures as well as the discolouring of fabrics. Usually, turbidity is measured in NTUs (nephelometric turbidity units). Typical drinking water will have a turbidity level of 0 to 1 NTU. Turbidity can also be measured in ppm (parts per million), and its size is measured in microns. Turbidity can be particles in the water consisting of finely divided solids, larger than molecules but not visible by the naked eye, ranging in size from .001 to .150 mm (1 to 150 microns). The Canadian Drinking Water Standards have established an MCL for turbidity to be less than 1.0 NTU because it interferes with the disinfection of the water.
Treatment of Turbidity: Typically, turbidity can be reduced to 75 microns with a cyclone separator, then reduced down to 20 microns with a standard back washable filter, but flow rates of 5 gpm/ sq. ft. are the recommended maximum. Turbidity can be reduced to 10 microns with a multimedia filter while providing flow rates of 15 gpm/sq. ft. Cartridge filters of various sizes are also available down into the submicron range. Ultrafiltration also reduces the turbidity levels of process water.
Source of Uranium: Uranium is a naturally occurring radionuclide. Natural uranium combines uranium 234, uranium 235, and uranium 238; however, uranium 238 makes up 99.27 percent of the composition. All radionuclides are considered carcinogens; however, the organ each attack is different. Uranium is not a proven carcinogen but accumulates in the bones, similar to the way radium does. Therefore, the Canadian Drinking Water Standards tend to classify it as a carcinogen. Uranium has been found to have a toxic effect on human kidneys. The Canadian Drinking Water Standards’ maximum allowable content for uranium is 0.02 mg/L.
Treatment of Uranium: Uranium can be reduced by both cations and anions, dependent upon its state. Reverse osmosis will reduce uranium by 95 to 98%. Ultrafiltration will also reduce the amount of uranium. Activated alumina can also be utilized.
Source of Viruses: Viruses are infectious organisms that range in size from 10 to 25 nanometers [1 nanometer = one billionth (〖10〗^(-9)) of a meter]. They are particles composed of an acidic nucleus surrounded by a protein shell. Viruses depend totally on living cells and lack independent metabolism. There are over 100 types of enteric viruses. Enteric viruses are viruses that infect humans. Enteric viruses that are of particular interest in drinking water are hepatitis A, Norwalk-type viruses, rotaviruses, adenoviruses, enteroviruses, and reoviruses. The test for coliform bacteria is widely accepted as an indication of whether or not the water is safe to drink; therefore, tests for viruses are not usually conducted. Major enteric viruses and their diseases are shown below.
Enteroviruses (Polio, Aseptic meningitis and Encephalitis)
Reoviruses (Upper respiratory and gastrointestinal illness)
Adenoviruses (Upper respiratory and gastrointestinal illness)
Hepatitis A (Infectious)
Treatment of Viruses: Chemical oxidation/disinfection is the preferred treatment. Chlorine feed with a 30-minute contact time for retention, followed by activated carbon filtration, is the most widely used treatment. Ozone or iodine may also be utilized as oxidizing agents. Ultraviolet sterilization or distillation may also be used for the treatment of viruses.
VOCs (Volatile Organic Chemicals)
Source of VOCs: VOCs (Volatile Organic Chemicals) pose a possible health risk because many of them are known carcinogens. Volatile organic chemicals are man-made; therefore, the detection of any of them indicates that there has been a chemical spill or other incident. Volatile organic chemicals are listed below.
Volatile Organic Chemicals (Maximum Allowable Limit – mg/l)
Carbon tetrachloride (0.005)
Dichloroethane (ethylene dichloride) (0.005)
Vinyl chloride (0.002)
Methylene chloride (dichloromethane) (0.005)
Treatment of VOCs: The best choice for the removal of volatile organic chemicals is activated carbon filtration. The adsorption capacity of the carbon will vary with each type of VOC. The carbon manufacturers can run computer projections on many of these chemicals and give an estimate as to the amount of VOC which can be removed before the carbon will need replacement. Aeration may also be used alone or in conjunction with activated carbon. Reverse Osmosis will remove 70 to 80% of the VOCs in the water. Electrodialysis and ultrafiltration are also capable of reducing volatile organic chemicals.
Want to learn more? The Canadian Drinking Water Guidelines are available at http://www.hc-sc.gc.ca/ewh-semt/water-eau/drink-potab/guide/index-eng.php.
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