I have tried every litter. One of my two cats will ONLY use clay litter. The problem is that we're sharing a very, very small bedroom in my parents house. We have been so far for about 6 months and will for another few months. I just cleared out the closet from my mother's belongings and put the box in there and it really didn't help that much. The silica dust is making me really sick. I can barely breathe and I spend the majority of my day + sleep in this room and I have this burning in my chest and nose that's really bad. It gets a little better when I leave the house. Last night, he used the pee pad with this walnut litter very reluctantly. I have some of the old litter mixed in with it. I would like it if he would just use the pee pads because this walnut stuff stinks and it's not very easy to clean. I know cats need to bury their waste but on google, I have seen some people that have trained their cats to do this. Additionally, if he can pee on the bed and not worry about burying it, I don't see why he can't pee on a pad all the same. My girl cat is also not pleased by the arrangement but I can't breathe anymore. My eyelids are swelling and doctors are pointing to the litter exposure. I vacuum twice daily, I clean the box each time they go. It's the dust. It's killing me, probably literally. We moved from a house into this situation so I never had this issue before. This is temporary but indefinite and I don't want to give them up.