RO System if untreated cause several problems like inorganic, colloidal & bio fouling resulting in reduced permeate recovery, increased pressure differential & permeate conductivity, frequent membrane cleaning ultimately premature membrane failure. Scaling elements like carbonates, Sulphates, Silicates, iron, fluoride & aluminium are highly effective threshold agent inhibit precipitation of these salts by increasing their their solubility limit. It is also acts as iron sequester thereby iron fouling.