Each time my coco litter its get messy and smelly, I put litter box at the toilet, even I changed to higher litter box she still make a mess whenever she urine or shit,its stinks too the smell.. and what kind of sand, you guys recommend? Any suggestion? Plz help! I tried all types of sand from frangrances but its clamps easily when she comes out and my floor is full of the sands everywhere !