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aeration agents alkalinity ammonia anion bicarbonate blowdown boiler feedwater boiler water calcium carbonate calcium sulfate carbon dioxide carryover cation chlorine chromate circulating water coagulant color condensate cooling tower cooling water systems copper corrosion corrosion inhibitors cycles of concentration deaeration deposits Dianodic dissolved oxygen dissolved solids effect effluent employed equipment feed feeder ferric Figure filter filtration hardness hot process hydrogen sulfide hydrogen zeolite hydroxide increase industrial inhibitors installation ion exchange iron lime lime-soda softening magnesium makeup water ment metal method nitrate once-through operation organic oxide phosphate plant polyphosphates precipitation present pressure pump raw water reaction recirculating reduce regeneration residual resin result salts sample scale formation silica silica removal sludge soda ash sodium carbonate sodium sulfite sodium zeolite solids content soluble solution steam sulfate sulfuric acid surface tank temperature tion tubes turbidity unit usually valve wood zeolite zeolite softening