In-tank cleaner automatically cleans and deodorizes for up to 900 flushes. Prevents scale build-up. Colors water blue with each flush. Has 22% surfactant formulation. Lasts up to 30 days and fits a variety of different tank styles. Application: Bowl Cleaner; Dirt Types: Mineral Scale, Soil; Scent: Unscented; Volume Capacity: 9 oz.