Replacing the existing cartridge is easy. Just slide the sanitary cartridge into the Scoop Free Automatic Litter Box and reattach the waste cover. The Scoop Free Replacement Litter Cartridge absorbs odor and moisture on contact, and after your cat leaves the litter box, the ultra-quiet Scoop Free automatically rakes the waste into a covered trap, leaving the litter bed smelling clean and fresh. The Scoop Free Replacement Litter Cartridge uses disposable...   Show More

Replacing the existing cartridge is easy. Just slide the sanitary cartridge into the Scoop Free Automatic Litter Box and reattach the waste cover. The Scoop Free Replacement Litter Cartridge absorbs odor and moisture on contact, and after your cat leaves the litter box, the ultra-quiet Scoop Free automatically rakes the waste into a covered trap, leaving the litter bed smelling clean and fresh. The Scoop Free Replacement Litter Cartridge uses disposable litter tray cartridges filled with Fresh Step® crystal litter, which stops odors significantly better than clay litter. Just change the disposable litter cartridge every 20 to 30 days (10 to 15 days for two cats) and toss the old cartridge away without seeing, touching, or smelling messy waste.   Show Less