PetSafe ScoopFree Crystal Litter Tray Refills, Premium Blue Crystals, 3-Pack, Disposable Tray, Includes Leak Protection & Low Tracking Litter, Absorbs Odors On ContactEASY, QUICK CLEANUP: No scooping required; when its time to clean up, simply remove the disposable litter tray and throw it away REMOVES ODORS QUICKLY: Crystal litter absorbs urine and dries solid waste to quickly remove odors 5 times faster than clumping clay litter LONG LASTING: Each tray comes with 1 bag (4. 3 lb) of premium crystal litter which can last up to 30 days in a single cat household that means less time cleaning the litter box LEAK