The Ariel Litter Box is both functional and practical in use. The cat litter tray is equipped with a sieving system that avoids the waste of litter, and avoids the hassle of scooping. To remove the old litter, just lift the perforated bottom and sift the litter that will be separated. The used litter will remain in the sieve to be thrown away, and in the bottom you will have the still usable litter to be replenished with new litter.