ScoopFree litter trays and ScoopFree litter boxes is a unique cat litter tray system which means no more cleaing the litter! ScoopFree litter boxes automatate the cleaning of the tray, the silica cat litter dries the waste meaning each refill tray can last up to four week, then just replace it. If you have many cats you may need to replace the litter tray more frequently, the high sided litter tray keeps more waste and litter in the tray, the drying of the waste by the scoopfree litter means very little smell. Once tried you will never go back to a basic litter tray and scooping that cat litter.