This acid descaler, formulated from renewable resources (citric acid) is designed to rid the dish machine of scale and lime formations due to hard water precipitates. The formula also performs very well as a concrete, hard tile and grout cleaner to strip slippery or oily build up. Bottles are color coded to the proper dispenser. The product is 100% biodegradable. Approved by the EPA Safer Choice/Design for the Environment Program (DfE). Two 6-pound bottles per box.