When we got Boo, the humane society gave me this pebbley kitty litter. It smelled awful and one of my biggest reservations about getting a cat was that god awful "cat smell" that I've encountered before at friends' homes. So Sam and I saw the crystals (that's what we call the silica litter) and we have not turned back since. The stuff is amazing!! No smell, super absorbent and reasonably priced.