The Fluidmaster 8300P8 Flush 'n Sparkle Automatic Toilet Bowl Cleaning System with Bleach offers scrub-free and hands-free cleaning of your toilet bowl with every flush. The Flush 'n Sparkle Bleach Cleaning System puts a powerful bleach cleaning solution directly into the overflow tube of the flush valve, so no chemicals ever touch the flapper, fill valve, or other tank parts. Preventing the damage drop-in tablets normally inflict, leading to breakdown and part malfunction. The Flush 'n Sparkle Cleaning System with Bleach offers a powerful toilet cleaning solution that lasts up to 3 months. Installation is easy and fast in just 3 quick steps you can clean your toilet bowl without damaging your toilet.