Activated carbon is produced from carbonaceous source materials, such as coconuts, nutshells, coal, peat and wood. The primary raw material used for activated carbon is any organic material with a high carbon content. Activated carbon is used to purify liquids and gases in a variety of applications, including municipal drinking water, food and beverage processing, odor removal, industrial pollution control. Adsorption is a process where a solid is used for removing a soluble substance from the water. Activated carbon is produced specifically so as to achieve a very big internal surface (between 500 - 1500 m2/g). This big internal surface makes active carbon ideal for adsorption. Active carbon comes in three variations: Powder Activated Carbon (PAC), Pelletized Activated Carbon (EAC), and Granular Activated Carbon (GAC).