The CLR Calcium, Lime and Rust Remover Cleaner is a septic safe, 828 ml solution designed for dissolving stubborn calcium, lime deposits, and surface rust stains effortlessly. Its fast-acting, powerful formula requires no scrubbing. It is phosphate, bleach, and ammonia-free, making this non-abrasive cleaner safe for use on tubs, toilet bowls, sinks, glass, chrome, fiberglass, stainless steel, coffee makers, humidifiers, dishwashers, washing machines, and shower heads. However, it is not recommended for use on wood, clothing, marble, terrazzo, natural stone, coloured grout, painted surfaces, plastic laminates, Formica, or aluminum surfaces. After a 2-minute application, simply rinse with cold water.