Abstract: Two tub containers are piled together, inside upper top one storing litter of either very tiny stones or other tiny solid material, where cats can bury feces; in bottom of upper tub container making tiny seams and slits to let cats' urine pass downward to hygiene water in lower tub container, or to earth and lawn. Scoops are for use to remove dung away. As urine is not absorbed by the litter, but pass to elsewhere and dung can be picked away, this cat toilet can always be kept clean without necessity constantly to replace litter, this will be much more economic and easier to keep clean as well as to protect environment.