KX MATRIKX Pb1 10-Inch Carbon Block Water Filter Cartridge with Bonus Pentek P5 5 Micron Sediment Cartridge Matrikx KX PB1 06-250-125-975 features Lead, Cyst and Turbidity Reduction Based on NSF/ANSI Standard 53 Outstanding Chlorine Taste and Odor Reduction Based on NSF/ANSI Standard 42 Pentek P5 Sediment Cartridge can be used as a pre filter for extra high dirt holding capacity and longer life Extruded activated carbon provides several times greater life than molded filters. MADE IN USA 0.5 m Nominal Filtration