The free chlorine limit in drinking water is 0.2–0.5 mg/L. Polyamide membranes suffer irreversible damage above 0.1 mg/L of chlorine; that is why activated carbon or metabisulphite dosing is essential before RO. Chloramine is more stable and requires catalytic carbon for removal.
Technical glossary· Disinfection
Chlorine and Chloramine
Short definitionOxidising agents used to disinfect mains water that cause taste and odour problems and damage RO membranes.
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