6 Uses-Rust and Hard Water Stain Repellent Cleans with Each Flush-45 Days Per Tablet

Best on Rust: #1 Heavy-Duty Rust Stain Remover Brand. Repels rust and hard water with every flush of your toilet. Convenient rust stain solution, long-lasting formula prevents rust stains from forming in toilet bowl for up to 45 days. Tested safe for use with all toilets, internal toilet components, plumbing and septic systems. Simply drop tablet in toilet tank and let Iron OUT do the work for you. Use Iron OUT powder or liquid spray rust stain remover to clean the bowl before inserting tablet in tank