PetSafe ScoopFree Self-Cleaning Litter Box, Second GenerationLet the Box Do the Work No scooping, cleaning or refilling your cat's litter box for weeks Strike scooping the litter box off your to do list. With the ScoopFree Self Cleaning Litter Box, theres no scooping, cleaning or refilling your cats litter box for weeks. It uses crystal litter which provides 5 times better odour control than traditional clumping litter. Crystal litter absorbs urine and dehydrates solid waste. This low tracking litter also helps