I have had three littermate kitty pottys. You'd think I would have learned after the first two. It's such a great idea to have a Loo which sweeps the poop into a closed container....wrong!!! My cat pees straight toward the back and gets the automatic rake soaking. When it moves forward, it accumulates a large blob of clumped litter which sticks in the tines of the rake and won't come off unless I go with the cleaner tool and manually clean off the tines. This happens once or twice a day. It works ok for solids, but terribly for liquid waste. Not a good design. I have tried to contact the company to no avail despite 60-70 minutes on the phone....from these waits, I get a canned response which has no bearing on my problem. They are impossible to contact by phone. I won't buy # 4 and am sorry I bought the first three.Wishful User