I got the PetSafe Premium Crystal litter 2-pack and am so incredibly satisfied. I've been a cat lady since birth. So. I have used all kinds of litters clay, clumping, pine pellets, and other crystal litters. Nothing compares to PetSafe. There is absolutely no urine smell whatsoever.  And it lasts. With my last crystal litter I was still changing the entire contents of my litter boxes about every 8-10 days. I'm going into my 3rd week and still no need to change the litter. It looks and smells the exactly same way as it did when I poured it into the boxes. Im happy. My cats are happy and I plan to stock up on this great litter