Descaler removes scale build-up due to rust, hard water deposits, and detergents. Removes calcium, lime, and other hard water deposits in the water system. Cleans your unit’s components by descaling the pump, bypass valve, water lines, and heater. An absolute necessity for proper maintenance of your most important asset. For best results, descale every 6 months or 500 hours of machine use, whichever comes first. Does not contain traditional acids such as Hydrochloric, Phosphoric, Sulfamic, etc. Descaler is non-corrosive and can be shipped via ground as a DOT non-regulated product.