This litter is great except for one thing. It lasts longer than clay/rocks. It does not smell (of urine) EVER, even when scooping. If I scoop every day, I may never have to empty and refill the box, but just add to it. I don't have to use nearly as much and it doesn't smell. I would have given it 5 stars if it didn't leave a mess worse than the clay/rocks. I have a covered litter box and a special mat to catch when she walks. But it still ends up getting tracked around the house. It is a fine dust, hard to see and clean up. The clay/rocks are easy to see and to clean up. Maybe there is a mat designed to catch the dust instead of the one I have which works well for the rocks. That is a big problem that I may go back to the clay/rocks.