An indicator solution used to measure the free chlorine residual. A granular material which is used to lower the pH or total alkalinity. Hypochlorous acid or hypochlorite. This is the active chlorine that kills bacteria and algae and keeps your pool clear and clean. The amount of calcium or magnesium dissolved in the water.
High levels contribute to scale deposits.
The active form of chlorine in water. The material which performs the sanitizing and oxidizing. A liquid used for lowering pH or total alkalinity. And outdated indicator solution that was used to measure the total chlorine residual. A chemical which helps prolong the useful life of chlorine in the water by slowing down chlorine decay due to sunlight.