Disinfecting SaniSolution Smart Cartridges are designed for use with the CatGenie Self Washing/Self Flushing Cat Boxes. Dispensed after each use, the special SaniSolution washes and disinfects the bowl and granules, while the GenieHand scoop aerates and the built-in hot air blower dries the sanitized granules. Washable Granules for occasional replenishment  are also available separately. Each SaniSolution Smart Cartridge lasts for approximately 60 uses.