Even when your toilet looks clean, it can be full of germs you can't see. Be safe, clean and deodorize with every flush. Cleaner/disinfectant helps prevent mineral and hard water stains while it kills 99.9% of all common bathroom bacteria. Concentrated to deliver continuous cleaning action for up to 4 months.Powerful chlorine bleaches away stains. Keeps toilet bowls continuously sanitary, stain-free and deodorized. Not harmful to septic tanks or plumbing when used as directed. 2 tablets per box, and 6 boxes per case, equaling 24 tablets in total.