Disinfection Chlorine is added to kill disease-causing organisms. This makes them heavier so that they will settle to the bottom of the basin. Flocculation The water mixed to make sure the added chemicals are well blended and react with all of the smaller particles. The water is drawn through filters, which remove finer particles still in the water for additional purification. Final Treatment Fluoride is added to help prevent tooth decay, while zinc orthophosphate is added to minimize corrosion activity between water and piping materials.
Ammonia is added to reduce chlorine-like tastes and to maintain the chlorine in the water.