Granular (granulated) activated carbon water filters are great for reducing chlorine and other contaminants that effect water taste and odor. We are able to sell these extremely popular filters at deep discount prices because of our large volume purchases. Granular activated carbon water filters are effective because of their adsorptive characteristics. Adsorption is the capability of all solid substances to attract to their surfaces molecules with which they are in contact. Granular activated carbon water filters can remove chlorine, volatile organic compounds and contaminants which effect taste and odor.