PUREFORCE DESCALER is a descaler and delimer used by professionals for cleaning and removing heavy scale buildup. This product is safe to use on ceramic tile, grout, porcelain and fiberglass tub/showers, chrome, glass doors, plumbing fixtures etc. PUREFORCE DESCALER works well in hard or soft water conditions. DO NOT USE ON MARBLE, WOOD OR LACQUERED SURFACES. This product is available as a Gallon.