I gave up on litters for the ferts litter boxes. I have several corner pans scattered throughout the house. I also have 5 cats. As long as there was any type of litter in the pans, the cats felt free to use them too. Of course cats need to bury their deposits resulting in far-flung litter. Finally, I got rid of the litter altogether. The ferts still use the corner pans, the cats don't and it's so easy to clean now. A couple of swipes with a paper towel takes care of the "deposits". This also remedied the problem of Theo and Kiwi digging in the litter. Not only did I get rid of the litter but I made them a rice box for their digging and snorkeling pleasure. Life is good again! :-) Renee [Posted in FML issue 2857]