I use a combination of litters. Some of the pans that are down on the floor are filled with newspaper that I tear by hand into strips. The ink used is a safe, non-toxic, vegetable--our vet said it was perfectly safe and we have been doing it for more than 4 years now. The bunnies love to play in it--dig and burrow under so all you can see are their ears. They also scatter it around and chew it. I change each pan as needed as some get higher usage than others. Hope this has been helpful.