Say goodbye to the mess and smell of litter boxes with ultra absorbent, ultra clean, long-lasting Multi-Cat 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. Multi-Cat formula is specially designed for use in households with two or more cats. Each 4 lb bag is a month’s supply of litter, and 8 lb jug will last approximately two months.