This is a good product but not for a household that has more than 1/2 cats. I currently have 4 cats and have found that the clumping litter - after a 24-48 hour period - goes into a solid mass which cannot be sifted. I ended up putting the entire contents of the litter tray in to a black bin bag. Again, this is a good product but not for a multi-cat household. My cats now use three Giant Van Ness sifting cat litter trays.