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acid activated carbon aeration algae alkalinity alum Amer applied basin calcium carbonate carbon dioxide cause caustic cent chemical chloramine chlorine dioxide coagulation Coliform color compounds concentration copper sulfate corrosion detergents discharge disinfection dissolved distribution system dosage effective effluent equipment exchange feeder feeding ferric filter runs filtration floc flocculation flow fluoride gallons per square hydrogen hydrogen sulfide hydrous oxide installations liquid magnesium manganese material million gallons mixing operation organic oxide particles pH value pipe plant precipitation pressure produce Public Health pump purification rapid sand filters raw water recarbonation reduce removal reservoirs residual chlorine sand bed sand filters sludge slurry soda sodium sodium chlorite soluble solution square foot storage sulfur dioxide surface tank taste and odor temperature tion trucks turbidity units utilized valves velocity wash water Water and Sew water supplies water treatment Water Works Asso Water Works Eng