Naturally Fresh Quick-Clumping Cat Litter. Naturally Fresh Quick-Clumping litter is a super-absorbent formula that works best for pet parents of one or two cats – it zaps ammonia odors on the spot and produces harder clumps for quicker, easier cleanup. Forms tight clumps fast: This clumping cat litter formula produces tight clumps in as little as 15 minutes, making it the best cat litter for speedy cleanup. Scoops easily: Naturally Fresh walnut shell litter doesn’t stick to the litter box, so you can scoop away cat litter more easily than messy clay litter formulas. Absorbs 3X better than clumping clay litter*: Naturally Fresh 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