CatGenie 120 SaniSolution SmartCartridge (Scent Free, 2-Pack w/ Washable Granules) Convenient 2 Pack of Scent Free SaniSolution and 1 box of Washable Granules. For use with CatGenie Self-Washing Self-Flushing Cat Box Lasts for up to 480 washings Biodegradable and recyclable