Pestell Clear Choice Cat Litter quickly absorbs odor and moisture making litter box maintenance an easy chore. Millions of micro-pores in each silica crystal granule act like tiny sponges, quickly absorbing and trapping odor-causing particals. The indicator crystals fade in color after a few exposures to moisture - when all the indicator crystals fade, it's time to replace the litter! Dust free and low tracking, it helps keep your litter box area clean.