Water contains various microorganisms, bacteria, protozoan, that contribute to a bio-film formation on the membrane surface. Killing bacteria and microorganism using sodium hypochlorite before it enters the membrane prevents bio-fouling on the membrane and increase its life.

The typical chlorine dose is about 3 mg/L of active chlorine. pH is corrected to around 7.5 to have optimized chlorine disinfection potential.

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