Helps you say goodbye to the mess and smell of litter boxes with ultra absorbent, ultra clean, long-lasting Crystal Litter Gems. Unlike clay litter, the granules of our litter are made of 100% silica crystals that trap moisture and odor in seconds. The excess liquid evaporates, locking odors inside for cleaner, dryer and fresher-smelling litter boxes. Inhibits the growth of bacteria for a healthier environment. Dust-free formula reduces tracking mess for easier cleanup. Incredibly long-lasting granules continue to absorb liquid for up to 30 days and remain clump free, requiring less changing for easy maintenance. Each 4 lb bag contains a month's supply of litter for a single cat and the 8 lb bag contains two month's supply of litter for a single cat.