Catit Design Sifting Cat PanCatit Design SmartSift is an automatic litter sifting system that takes the chore out of litter maintenance. To refresh the cat litter pan, all you have to do is pull the lever-it's that simple. It's so easy and mess-free. The lever activates an automated and noiseless Pull and Refresh process that quickly and efficiently refreshes the litter pan, while collecting waste in one easy operation. Clean litter is recycled back into the pan and waste clumps are deposited in a lined collection bin for easy disposal. Replenishing the litter is also easy, simply open the maintenance access door and add as needed.