Nelsen Enpress CT-03-CB, 3 Micron Carbon BlockThe Enpress Blue Filtration Series incorporates surface modified carbon block filter technology that is highly effective reducing bad taste, odor, and the reduction of chlorine and chloramines from potable drinking water. The filters are made using high performance coconut shell carbon, which has more micropores compared to other types of carbon. CT 03 CB 3 Micron Carbon Block, with High Capacity and High Flow The Nelsen Enpress CT 03 CB (Blue Series)