Water is essential to life. Human should drink clean water 2.5 liters a day. Chlorine can be used to sanitize water for drinking. The chlorination of water supplies serves primary to destroy or deactivate disease producing microorganisms. A secondary benefit, particulary in treating drinking water, is the overall improvement in water quality resulting from the reaction of chlorine with ammonia, iron. manganese, sulfide and some organic substances. Chlorination may procedure adverse effects. Taste and odor characteristics of unsatisfy and other organic compounds present in a water supply may be intensified.