Evaporating water leaves salts behind; as they build up, foaming, carryover and scaling begin. Blowdown rate = feed water TDS / permitted boiler TDS. When the feed water is treated with RO, blowdown drops from 10% to 2–3%, which means savings in energy, water and chemicals.
Technical glossary· Boiler, cooling and process
Blowdown
Short definitionDeliberately draining water from a boiler or cooling tower to keep the salt concentration within limits.
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