What is the return policy? Our return policy includes a 30-day exchange and return period, along with a 1-year supports for this product. If you have any questions, don't hesitate to reach out to our DuckSky support team. What cat litter should I use? We know that the litter box filters out clumping litter and retains it, so we recommend granular clumping litter rather than strips (strips or clumps won't pass through the filter). Why does the litter box make a mess inside after spinning? Due to the type of litter, some cat litters are slow to clump, which can cause a mess if the litter box starts to spin. We recommend setting the cleanup time to 5-15 minutes after the cat comes out (you can set this in the mobile app). Why has my litter box started spinning on its own and won't stop? When powered on initially, the device undergoes a 1 to 3-minute self-test. In addition, the litter box must be placed on a hard and flat ground. Do not place a blanket under it, which will cause the litter box to rotate abnormally.