Sift Away is the innovative way to cleanly change litter, and save money by only using one bag of litter for a full month. The secret is the three interlocking slotted trays – the top tray collects clumps while the bottom two catch the clean litter to reuse again and again. Sift Away works with any brand of litter, and works so no more scooping smelly, messy litter boxes.  Buy three trays and get three Trays for Free + a Free Grooming Mitt.  You will pay shipping and handling for the freebie trays.