Naturally Fresh Multi-Cat Ultra Odor Control Cat Litter. For pet parents who need Ultra Odor Control, Naturally Fresh took their naturally powerful odor - controlling litter and enhanced it with triple - action odor defense enzymes to stamp out fecal, urine, and ammonia odors on contact. Eliminate multi-cat litter box odors: A moisture-activated probiotic gets rid of fecal, urine, and ammonia odors on contact in homes with three or more cat kids, making this the best cat litter for odor control. Walnut shells organically neutralize odor: Naturally Fresh makes their exclusive eco-friendly cat litter out of the fibrous material of the walnut shell due to its organic ability to eliminate odor better than clay litter and other natural litters. Absorbs 3X better than clumping clay litter*: Naturally Fresh's odor absorption capacity is at least 3 times greater than the leading clay litter, so you can refill the cat litter boxes less often. *In an independent study, Naturally Fresh Cat Litter was found to absorb ammonia odors three times better than the leading clay litter. Available Sizes: 14 lb / 26 lb