One litter box that I tried was covered with a built-in sifter. The concept was to turn the litter box over on the side so the litter went through the sifter, and after that shake a few times. Regrettably, I in some cases got litter on the flooring outside of https://catlitterbox.us/products/patlool-clumping-tofu-cat-litter-green-tea-scent