Besides treating the circulating cooling water in large industrial cooling tower systems to minimize scaling and fouling, the water should be filtered and also be dosed with biocidesand algaecides to prevent growths that could interfere with the continuous flow of the water.[12] Under certain conditions, a biofilm of micro-organisms such as bacteria, fungi and algae can grow very rapidly in the cooling water and can reduce the heat transfer efficiency of the cooling water. Biofilm can be reduced or prevented by using chlorine or other chemicals. Other technologies to control algae and biofilm include:[14][15]
For closed loop evaporative towers, corrosion inhibitors may be used, but caution should be taken to meet local environmental regulations as some inhibitors use chromates.
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