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acid aeration air washer alkalinity anion anodic areas attack bacteria blowdown boiler water calcium carbonate calcium sulfate carbon dioxide carryover cathodic cation cause cell chelant chemical chlorine chromate cleaning condensate containing cooling systems cooling tower cooling tower systems cooling water systems copper corrosion control corrosion inhibitors cycles of concentration deaerator deposit control dissolved solids dosage drum effective evaporation feed feedwater ferrous film filter flow fouling heat exchanger heat transfer hydrazine hydrogen hydrogen sulfide hydroxide increase ion exchange iron lime magnesium makeup water metal surface microbiocide microbiological nozzle operating organic oxide oxygen perature phosphate plant polymers polyphosphate precipitation pressure problems pump reaction recirculating reduce regenerant removal resin result rosion salts sample scale shown in Figure silica sion sludge sodium sodium sulfite soluble solution spray steam steel sulfate sulfuric acid superheater temperature tion treated water tubes usually velocity water treatment zeolite zinc