A chlorinator adds chlorine to drinking water to eliminate parasites, bacteria, and viruses. Chlorinators are also used for swimming pool water, odor control of slime and marine growths in cooling water towers, circulating water, and in service water systems.Chlorinators are also used for swimming pool water, odor control of slime and marine growths in cooling water towers, circulating water, and in service water systems. Replacement salt cells and chlorinators. Pool equipment. We Have a Great Selection of Pool and Spa Equipment. Permanent and continuous chlorination of a private water supply can be done through a chlorine pump, solid feed unit, aspirator or suction device. Public water systems use chlorine in the gaseous form and private water systems use liquid chlorine or dry chlorine.