Therapet’s Cat Litter Crystals are made of super absorbent, 100% silica crystals that make odors, moisture and bacteria disappear like magic. The crystals are all natural, non-toxic, dust free, stay clump-free for 30 days, and eliminate odor on contact! They reduce litter tracking, and can be used alone, or combined with regular litter. One 8 pound container is approximately a 2 month supply for 1 cat.