I have three Jumbo litter boxes for my nine. I scoop in the morning, evening, and before I go to bed. We do not completely empty and clean as often as we should. Probably every six months unless there is goo on the sides. We just keep adding fresh litter as needed. They seem ok with it so I'm ok with it. http://petoftheday.com/talk/images/o...es/biggrin.gif