Multi-Cat Quick-Clumping Formula. Naturally Fresh listened to cat parents when they said their #1 priority when choosing a cat litter is odor control. For pet parents who need maximum odor control, we took our naturally powerful odor-controlling litter and enhanced it with triple-action odor defense enzymes to stamp out fecal, urine, and ammonia odors upon contact. This all-natural formula also features tight clumps in as little as 15 minutes and virtually no dust, while remaining the go-to walnut shell litter for eco-conscious customers.