Well, in the past I use plain old clay. Then I got the litter maid and had to have clumping litter. I will say, the litter maid works but you have to have very good clumping litter and a cat that isn't toooo big. I started out with these kitties with a newspaper one, don't remember the name but it was tracked everywhere. I can never remember which one I got last so just usually get the cheapest of the clumping. Right now am using Cat's Pride. Would like to try the Wheat one but can't get it here.
Really want to get the kitty toilet so I don't have to scoop anymore but......it is so expensive. But with long term litter boxes, it may just be a savings in the long run.
Sorry for being so long winded Hissy.