A powerful formula that quickly and easily dissolves and removes tough calcium and lime deposits as well as surface rust stains from bathtubs, toilet bowls, sinks, glass, chrome, fiberglass, stainless steel, most coffee makers, humidifiers, dishwashers, washing machines and showerheads. The formula also is perfect for use on RVs and boats. Part of the EPA’s Safer Choice Program and contains no phosphates and is Septic Safe. 28 oz.