This item works fine until it gets crudded up with dried on poop and litter. It's a nightmare to clean, and my box went dead after 6 months. I wrote to the company TWICE and got no response at all! I would advise against buying this product. It takes less time to rake out a litter box 1-2 times a day, than to clean the mess that this box creates! And yes, I did use the recommended litter -- it made no difference!!