Chlorination is the process of adding chlorine to drinking water to kill parasites, bacteria, and viruses. Different processes can be used to achieve safe levels of chlorine in drinking water.

Firstly, the cold water storage tank will be drained using submersible pumps and all internal surfaces are cleaned and aqua vacuumed dry. The tank is then refilled, sodium hypochlorite solution is added to achieve 50 ppm of chlorine and left to stand for one hour.