The idea is extroadinary..my 2 cats now are used to the box. I find that there is a urinary smell,that permeates the room where the box is kept... There was none when I personally scooped out the urine and feces a few times a day, using the cheapest litter for the 2 boxes. I do change this box every 11 days....and find that I have to spray an aresol to eliminate the odor. They eat Purina Salmon "One Beyond".