Although sodium bentonite alone offers excellent odor-binding properties, the combination of activated carbon and sodium bentonite works wonders when it comes to complete odor binding. Activated carbon is made from coconut shells, a completely natural, highly porous form of charcoal. The large internal surface of the activated carbon with special pores traps bad odors such as ammonia and cat feces. It is ideal for homes with male cats, older cats, or multiple cats.