As a twenty + year cat parents, we have tried many brands and types of litter. Currently, we have only one senior cat with minor ambulatory issues. The clumping clay we were using would form horrible rack hard clumps on her toes. Additionally, I had to add litter with every time I scooped. we decided to try Catalyst and it was a terrific decision. I was very skeptical of only needing one bag a month, but it is true! I find myself adding more litter just on general principal as the amount in the litter box never seems to decrease! There is only a very pleasant sawdust smell and, best of all, NO HORRID CLUMPS ON WAFFLES' TOES! Thank you.