No, I haven't. I don't think this is really something I would bother using for cats. As long as you keep the litter box clean and use a good material like corn there is virtually no odor. I did look it up and it looks like it's made of zeolite which is naturally occurring but most zeolite is man made because of the impurities found in the naturally occurring version. One of the ingredients used to made it is silica which is dangerous to cats so I have no idea if the finished product would be safe. It does look interesting for larger animals but probably not necessary for cats! Down the research rabbit hole I go 😆