Started using a new litter box for my indoor cat named max. He started using the ScoopFree Self-Cleaning Second generation Litter Box, which we both love. This litter box takes trays of pearl litter. So easy to remove and replace with a new tray. I love it because no more smelly box. It only has to be changed once a month. The machine rakes the litter after every use. Also has a counter on it to tell how many times max uses the bathroom. A very clean litter box. Love it.