Highly chlorine-tolerant polymers for desalination.

Consequently, membrane manufacturers recommend thatfeed-water chlorine concentration to such membranes belimitedtoconcentrationslowerthan0.1ppm.Tomeettheseconflicting requirements, water to be purified is oftenchlorinated,todisinfectitandultimatelyinhibitbiofoulingof the membranes, then dechlorinated before being fed tomembrane desalination units. After passing through themembranes, the water is then rechlorinated before beingsenttothedistributionnetwork.

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