Chlorine Online provides facts on chlorine chemistry - describes the elements of chlorine and how it is made from electricity, salt and water. It includes information on PVC, polycarbonate, polymers, pharmaceuticals, solvents and other products such as bleach and swimming pool disinfectants, silicon chips and auto parts, as well as information on chlorine effects on human health and the environment. Worldwide use for water purification is highlighted; here chlorine provides the ultimate defence against waterborne illness.