I used the paper based pellet litter and all it did was absorb the pee, it never killed the smell making it smell horrible. I switch to the pine pellet litter, feline pine, and what a huge difference. Sure it turns into sawdust when they pee on it, but there is no urine smell. It just smells like wet sawdust when I scoop it out. Not to mention their pen and room smell like pine. Sooo much better. I am definitely going to get a couple bags of the wood stove pellets too. Can't beat $5.00 for a 40lb bag.