CRYSTAL QUEST&reg; Whole House Triple 20" x 5.0" Water Filter System GAC is universally recognized and widely used as an effective adsorbent for a wide variety of organic contaminants, such as chlorine, chemicals linked to cancer (THM's, benzine) pesticides, herbicides, insecticides, volatile organic compounds, PCB's, MTBE's and hundreds of other chemical contaminants that may be present in water that create bad taste and odors. KDF is a major advancement in water treatment technology that works on the electro-chemical and spontaneous-oxidation-reduction (REDOX) principles. Chlorine is instantaneously and almost inexhaustibly oxidized. Multi Stage conveniently provides 160,000 gallons Install Dimensions: 22.5L x 9W x (28H + 4 to change cartridges)