CatGenie Self-Flushing, Self-Washing Cat Box, CatGenie; CatGenie automatically scoops, liquefies, and flushes cat waste out of home. Uses water and SaniSolution to wash and sanitize Cat Bowl and Granules. CatGenie dries interior and Granules for your cat's comfort. Only CatGenie 120 SaniSolution Cartridges will work with the CatGenie 120. These are in Clear plastic. All green colored Cartridges will not work in this unit.