KX MATRIKX + Pb1 06-425-200-975 is a powerful, multifunctional water filter cartridge for residential and commercial water treatment systems. The KX MATRIKX 06-425-200-975 + Pb1 filter is made of extruded activated carbon that reduces soluble lead using an ion-exchange filter medium with high specificity for soluble lead. Particulate filtration is used to intercept insoluble lead-containing particles. The 06-425-200-975 + Pb1 filter offers high levels of chemical reduction in potable drinking water, including chlorine taste and odor. The KX MATRIKX + Pb1 Carbon Block Water Filters meet NSF/ANSI Standard 53 for Turbidity and Cyst Reduction, including Cryptosporidium, Giardia, Entamoeba and Toxoplasma. Graded-density filtration combined with high dirt capacity extruded activated carbon provide several times greater life than molded filters.