In-tank cleaner cleans and deodorizes. Prevents scale and mildew buildup. Colors water blue with each flush. Has 22% surfactant formulation. Lasts up to 30 days. Application: Bowl Cleaner; Applicable Material: Ceramics; Enamel; Fiberglass; Metal; Plastic; Vinyl; Dirt Types: Mildew; Mineral Scale, Organic Matter; Soil; Scent: Unscented.