This clumping cat litter formula produces tight clumps in as little as 15 minutes, making it the best cat litter for speedy cleanup. Our walnut shell litter doesn’t stick to the litter box, so you can scoop away cat litter more easily than messy clay litter formulas. Our odor absorption capacity is at least 3 times greater than the leading clay litter, so you can refill the cat litter boxes less often.