Descaler removes scale build-up due to rust, hard water deposits, and detergents. Removes calcium, lime, and other hard water deposits in plumbing system. Cleans your unit’s components by descaling the pump, bypass valve, water lines, and heater. An absolute necessity for the proper maintenance of your most important asset. Does not contain acids such as Hydrochloric, Phosphoric, Sulfamic, etc. Descaler is non-corrosive.