Classic clumping cat litter consists of ultra-absorbent bentonite clay, and even though bentonite is a natural substance, it isn't biodegradable and for that reason just isn't categorized for a "natural" cat litter. robust urine odour. Terrible clumping mess that finally ends up getting still left all throughout the household. I https://www.petskyonline.com/search/?query=cats%20best%20litter