Calcium, Lime & Rust Remover features a powerful formula that quickly & easily dissolves & removes tough calcium & lime deposits as well as surface rust stains. Versatile formula cleans plastic, ceramic tile, glass, stainless steel, faucet / shower fixtures, shower doors, fiberglass, sinks & more. Calcium, lime & rust remover is part of the EPA's Safer Choice Program recognizing the product as a safer alternative to chemicals. Fast-acting, powerful formula is septic-safe & contains no phosphates.