Used this for years but I've now switched to silicate. It clumps really well, but you need it deeper than specified otherwise it sticks to the tray and it's a nightmare to remove. Tracks something terrible. I had it in 4 boxes, 5 cats.. I went through tonnes of this stuff and it's expensive. The other thing is smell, it always smells to some degree even with a carbon filter in the box. I eventually looked for something else.