Sodium Bisulfate; a granular form of acid which is used to lower the pH or total alkalinity in a pool. FREE CHLORINE Hypochlorous acid or hypochlorite. This is the active chlorine that kills bacteria and algae and keeps your pool clean and clear. HARDNESS The amount of calcium or magnesium dissolved in water. High levels contribute to cloudy water and scale deposits. Low levels can cause water to "attack" or dissolve pool plaster and certain metallic components.
Chemically, sodium bisulfate. A dry white crystal that produces acid when added to water. It is used for lowering pH and total alkalinity. Safer to handle than muriatic acid. FFLUENT The water that flows out of a pump, filter or heater, usually on its way back to the pool or spa.