Our cat started doing his business outside his litter box and after many attempts, we realized that it was the specific litter's fault as his paws were hurting. As soon as we switched to a different litter, not crystal, he never did it again

The best crystal sand I have tried. It lasts twice as long as other more expensive ones and for crystal, it is good at limiting odors.

Very bad sand. It stays clean for only 5-6 days. Then it starts to smell and the worst part is that it becomes disgusting and muddy. Very disappointing experience for both me and my cat.