I have this covered litter box that you roll over to clean. It puts all the unclumped litter through a filter, and all the poop and pee clumps rolls over into a scoop. It's pretty awesome. The only problem is that the litter I'm using (feline fresh) is really sticky, so when a roll it over, must of the pee clumps stay stuck to the litter box, and I am forced to reach in with a scoop anyway. Does anyone know of some epic litter that won't stick so much?