I love the concept of Catalyst. The first bag was scented and my cats did not like it. I purchased the unscented and the multi-cat (which has a scent), and the cats seem to like the unscented. I thought I had a win until I started noticing dusty areas in my house. One of the cats jumped down from above and a cloud appeared around him and settled on the floor. After being away for a few days, leaving the cats with a sitter who didn't sweep as often as I do, I came home to lots and lots of dust. I'm terribly disappointed, as I really like the litter and the cats are used to it now. I just can't deal with the dust it leaves behind.