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Chemical Compounds & Terms Frequently Encountered in the Process of Water Treatment

Chemical NameChemical SymbolCommon NameUsed For
Aluminum Sulfate Al2 (SO4)3 Alum; Papermakers Alum, Coagulation
Filter Alum Coagulation Ammonia Gas Disinfection (when combined with chlorine to form chloramines NH2Cl)
Ammonia NH3 Ammonia Gas Disinfection (when combined with chlorine to form chloramines NH2Cl)
Calcium Bicarbonate Ca(HCO3)2    
Calcium Carbonate CaCO3 Calcite; Limestone; Whitting; Crushed Georgia Marble; Chalk Neutralization
Calcium Chloride CaCl2 “Ice Melting” Salt  
Calcium Hydroxide Ca(OH)2 Hydrated Lime; Slaked Lime Stabilization
Calcium Hypochlorite Ca(OCl)2 H.T.H. Disinfection
Calcium Oxide CaO Chemical Lime; Quicklime; Burnt Lime Lime Softening
Calcium Sulfate CaSO4 Gypsum; Land Plaster; Plaster of Paris Adsorption
Carbon C Activated Carbon Adsorption
Carbon Dioxide CO2   Stabilization
Chlorine Cl2 Chlorine Gas Disinfection
Chlorine Dioxide ClO2   Disinfection
Copper Sulfate (cupric) CuSO4 Blue Stone; Blue Vitriol Biocide
Ferric Chloride FeCl3   Coagulation
Ferric Hydroxide Fe(OH)3    
Ferrous Bicarbonate Fe(HCO3)2 Dissolved Iron  
Ferrous Sulfate FeSO4 Copperas; Green Vitriol Coagulation
Fluosilicic Acid H2SiF6 Hydrofluosilicic Acid Fluoridation
Hydrochloric Acid HCl Muriatic Acid DI Cation Regenerant
Hypochlorous Acid HOCl   Disinfection
Magnesium Carbonate MgCO3 Magnesite  
Magnesium Chloride MgCl2    
Magnesium Hydroxide Mg(OH)2 Milk of Magnesia  
Magnesium Sulfate MgSO4 Epson Salts  
Nitric Acid HNO3 Aqua Fortis  
Potassium Chloride KCl Table Salt Substitute; Muriate of Potash Softener Regenerant
Potassium Hydroxide KOH Caustic Potash  
Potassium Nitrate KNO Salt Peter; Niter  
Potassium Permanganate KMnO4 Permanganate of Potash; Cha- meleon Mineral Mn Zeol. Regenerant Chemical Feed
Sodium Bisulfate NaHSO4 Sodium Acid sulfate; Nitre Cake  
Sodium Bicarbonate NaHCO3 Baking soda; Bicarbonate of Soda  
Sodium Carbonate NaCO3 Soda Ash; (Sal Soda; Washing Soda) Neutralization
Sodium Chlorite NaClO2   Disinfection
Sodium Chloride NaCl Common (Table) Salt Softener Regenerant
Sodium Fluoride NaF   Fluoridation
Sodium Hydroxide NaOH Caustic Soda; Lye; Soda Lye DI Anion Regenerant Stabilization
Sodium Hypochlorite NaOCl Household Bleach Disinfection
Sodium Nitrate NaNO3 Chile Salt Peter  
Sodium Sulfite Na2SO3 Santosite Deaereation; Dechlorination
Sodium Sulfate Na2SO4 Glauber’s Salt  
Sulfuric Acid H2SO4 Oil of Vitriol; Vitriol, Oleum = 66 ° Be DI Cation Regenerant

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