Me again: I should add about worlds best cat litter that it is also dust-free, which is good for you (less dusting!) but also your cat. They have found problems with silica dust from clay & scoopable litter in cats lungs. And yes I double checked the web site, and it is www.worldsbestcatlitter.com. Gosh, I sound like a commercial for the stuff the way I am going-on, but it really is that great!