Finally, an automatic toilet bowl cleaner that unites the power of bleach with blue surfactants! Co-extrusion technology combines bleach and blue to sanitize, clean and deodorize with every flush. Concentrated tablet cleans continuously for up to four months. Tablet leaves bowl water blue to indicate effectiveness. Application: Bowl Cleaner; Applicable Material: Ceramics; Enamel; Fiberglass; Metal; Plastic; Vinyl; Dirt Types: Grime; Organic Matter; Soil; Stains; Scent: Rain Clean.