The absorbency of the clay granules makes them ideal for absorbing liquid waste and controlling odors. In addition, the clays act as a desiccant, drying out cat feces for easy disposal. The use of bentonite in cat litter became popular in the 1980s. Bentonite absorbs liquid waste by forming clumps, which can be easily removed, leaving the remaining litter for further use. While there have been a number of alternative litter products introduced to the marketplace over the years, none have proven to be as efficient or cost effective as clay-based litters.