CatGenie 120 SaniSolution Smart Cartridge, Scent Free (4-Pack) Compatible with the CatGenie 120 Self-Cleaning Litter Box Eliminates CatGenie litter box germs and odors Thoroughly cleans and sanitizes CatGenie Washable Granules up to 240 times Alerts you when solution runs low Cartridge is made with a biodegradable and recyclable translucent material