Question: why smbs dosing in ro?
Answer: When RO or NF membrane is used in the RO/NF process, the feed must be dechlorinated to prevent oxidation of the membrane. FilmTecTM membranes have some chlorine tolerance before noticeable loss of salt rejection is observed. ... Sodium metabisulfite (SMBS) is commonly used for removal of free chlorine and as a biostatic.