Even if your toilet looks clean, it can be full of germs you can"t see. Clorox automatic toilet bowl cleaner delivers Clorox bleach with every flush, working continuously to kill 99.9% of common household germs in toilet bowl water after each flush. Plus it also repels tough hard water, mineral and lime-scale stains to keep your toilet clean and fresh in between regular cleanings. Each tablet in this economical 4-pack lasts up to 3 months.