There are three main types of litter on the market: clay, silica, andplant-based. Knowing how each kind is made will help you decide which is best for you and your kitty.
Finally, bentonite clay may be mixed in to create aclumping litter. However, there are concerns around clumping litters as bentonite expands up to 15 times its original size once it gets wet. If Fluffy ingests these granules, they can cause internal blockages.