For granted : the water we drink

Shows the source, purification process, and testing of the culinary water supply of Gary, Indiana. Explains the use of chlorine and dry chemicals in purification and shows the function of settling basins and filtering tanks. Points out that frequent tests are made to determine softness, chlorine content, and purity of the water. Concludes with water going to the city through the pressure pump, water mains, and water tower.