ScoopFree Slide Easy-Clean Manual Litter Box ScoopFree Slide is the quick-clean manual litter box that virtually does the job for you. Slide uses disposable litter trays for convenience and odor control. Includes disposable litter tray pre-filled with Premium Blue Crystals to provide unbeatable odor control. Disposable litter tray has plastic lining that creates a barrier to help protect against leakage. Works with all ScoopFree disposable litter trays. Recommended litter tray replacements: At least once every 20-30 days for one cat, every 10-15 days for 2 cats, every 7-10 days for 3 cats Fast, clean and easy 90 Day money back guarantee