I was using Tidy Cats and didn't care too much for it so I tried several other brands and ended up liking Arm and Hammer with baking soda for multiple cats. It clumps good and keeps the smell gone. Being pregnant I leave the cat box cleaning up to my 7 yr old son and he hates doing it so it is like a day and a half or two days before it gets cleaned and I have never smelled my cats.