The Thetford Fresh Water Tank Sanitizer will rid your water system of harmful bacteria. All-in-one kit includes a 24 oz. bottle of detergent solution and a 24 oz. bottle of sanitizer that will sanitize and clean your holding tanks and lines. • Chemically-balanced sanitizer - even when diluted in hard water• Will not leave a grit or soap scum• Not a drinking water additive• Easy-to-Use 2 part system - Step 1: Clean tank with detergent and rinse - Step 2: Sanitize tank with sanitizer No grit of soap scum residue NOT a drinking water additive Easy-to-use 2 part system