The Fluidmaster 8300P8 Flush N Sparkle Bleach Toilet Cleaning System removes the unending hassle of keeping your toilet clean. This self- cleaning toilet bowl system eliminates outdated and damaging tablets and liquid cleaners. A superior solution to tablets that put cleaning materials in contact with toilet tank parts, shortening lifespan. Flush N Sparkle puts the cleaning solution directly into the overflow tube eliminating damage to flappers and other toilet tank parts. Simply flush the toilet to release the cleaning solution. A universal design that fit's most toilet models and installs in just a few minutes. Step by step instructions are included for an efficient DIY project that keeps your toilet bowl clean and stain free for up to 3-months. Refill cartridges are also available in bleach and are sold separately. Relax and let the toilet clean itself with the Fluidmaster Flush n' Sparkle self-cleaning toilet system.