Clorox Automatic Toilet Bowl Cleaner tablet cleans and deodorizes with the power of bleach and kills 99.9% of household bacteria in the toilet bowl water. Each tablet sanitizes the toilet bowl water in 5 minutes, cleans for up to 3 months, and helps prevent tough hard water, mineral, and limescale stains. These easy-to-use toilet tablets keep your toilet smelling fresh and sparkling clean with every flush, leaving bowl water crystal clear.