KX Matrikx 01-250-125-20 High Capacity Chemical, Chlorine Taste and Odor Reduction Filter, 20-Inch Filter consists of activated carbon particles fused into a uniform block with enhanced adsorptive capacity and efficiency Radial flow (outside-to-inside) filtration provides increased dirt-holding capacity with low pressure drop Color coded molded one-piece gasket and end cap Manufactured using FDA-compliant materials NSF/ANSI Standard 42 and WQA Gold Seal certified