Granular Activated Coconut Shell Carbon Acid Wash is a natural material derived from coconut shells, activated by steam and other means. Carbon is very popular due to its superior level of hardness; high activity level, trihalomethane removal, and longer life expectancy. Features: Improves taste and removes odors Acid Washed Dechlorination of water Removes color from water Removal of organic substances Removal of synthetic organic substances Clear water for drinking, bathing, and cooking NSF Certified to ANSI/NSF Standard 61 Save money by using Neo-Pure Coconut Shell Carbon Pillow Packs Use the Neo-Pure GAC-4PK Coconut Shell GAC Pillow Packs to conveniently refill a reusable filter cartridge and save the environment by not discarding plastic. 140 4-packs is equal to 1 cubic foot of media.