What is used in kitty litter?

There should be an ingredients list on the bag of litter as not all litter is the same. It depends on the type of litter (clay or wood pellets) and also the brand.

The cheapest and most common type of kitty litter is Clay. However, there are a variety of other absorbents that have been used including recycled newspapers, popcorn, and silica Gel.

See the link below for more information.