Kitty Litter Review. 100% recommend Naturally Fresh Walnut Kitty litter, especially if you’re looking to cut out litter box smells. I went a week with out scooping this box, I have two other giant litter box’s. 5 cats which 3 are indoor only. I also went from Dec 14- Jan 18 before the litter was actually changed and it still had no smell it was just low in the box. The urine is completely neutralized. So I changed over to all 3 litter boxes and the cats had no issues with the change. It actually stopped my one cat who liked to pee on the outside of the box, which I hang pee pads on, has not done it since. I’m really Impressed!!