The Fluidmaster 8300P8 Flush 'n Sparkle Automatic Bleach Toilet Bowl Cleaning System 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 in 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. The Flush 'n Sparkle Cleaning System comes with one bleach cartridge, and can be refilled with bleach, blue, or septic tank refill cartridges. Relax and let the toilet clean itself with Flush 'n Sparkle.