Coconut Shell Carbon for Water Purification Granular Activated Carbon (GAC) is manufactured from select grades of coconut shell and features a high density, large micropore volume and high surface area. It’s commonly used for the purification of potable water, beverage manufacture, dialysis, aquarium water and a variety of food grade applications. In properly designed systems,will effectively remove chlorine, chloramines, lead, radon, MtBE, TCE, PCE, THM’s, Phenols, pesticides, detergents, taste & odor, etc. meets AWWA Standard B-600-74, ANSI/NSF Standard 61 for drinking water applications.