Clear Choice Silica Crystal Cat Litter offers a level of convenience and performance never before available. Millions of tiny micro-pores are contained in each silica crystal granule and these act like tiny sponges, quickly absorbing and trapping odour-causing particles. Odour control is fast and complete. Indicator Crystals fade in colour after a few exposures to moisture so you know when its time to make a change. When all the Indicator Crystals are faded, its time to replace the litter. Remove solid waste as normal to maintain a clean and healthy litter box for your feline companion.