ScoopFree Litter Tray Refills with Premium Blue CrystalsThe ScoopFree disposable litter tray is the reason you can leave ScoopFree self-cleaning litter boxes alone for weeks at a time. The tray is completely disposable for hands-off convenience. It is pre-filled with Premium Blue litter, which has been proven to provide unbeatable odor control. You don’t have to see, touch …