From the Manufacturer The MATRIKX Pb1 (06-250-125-975) is a powerful, multifunctional filter cartridge for residential and commercial water treatment systems. MATRIKX Pb1 extruded activated carbon filters reduce soluble lead using an ion-exchange medium with high specificity for soluble lead. Particulate filtration is used to intercept insoluble lead-containing particles. Standard 10" Length (9.75" Actual) X 2.50" Diam. filters will reduce lead, meeting the performance requirements of NSF/ANSI Standard 53 protocol for over 2,500 gallons when operating at a flow rate of 0.75 GPM. Manufactured with KX's proprietary extrusion process, MATRIKX Pb1 filters offer high levels of chemical reduction in potable drinking water, including chlorine taste and odor. MATRIKX Pb1 filters meet NSF/ANSI Standard 53, Turbuyity and Cyst Reduction, including Cryptosporidium, Giardia, Entamoeba and Toxoplasma. Service life of the MATRIKX Pb1 filter is greatly extended by a prefiltration medium. Projected chlorine taste and odor reduction capacity when tested in accordance with NSF/ANSI Standard 42 protocol. Nominal particulate rating (0.5 m) is for >85% of a given size as determined from single-pass particle counting results. Absolute particulate rating (1 m) is for >99.9% of particles of a given size as determined from single-pass particle counting results. Nominal Filter Rating: Filter rating indicating the approximate size particle, the majority of which will not pass through the filter. It is generally interpreted as meaning that 85% of the particles of the size equal to the nominal micron rating will be retained by the filter. Absolute Filter Rating: Filter rating meaning that 99.9% (or essentially all) of the particles larger than a specific micron rating will be trapped on or within the filter. No channeling; No bypassing; Maximum service life and resistance to fouling; Graded density pre-filtration design; Manufactured using FDA-compliant materials Matrikx KX PB1 06-250-125-975 features Lead, Cyst and Turbuyity Reduction Based on NSF/ANSI Standard 53 Outstanding Chlorine Taste and Odor Reduction Based on NSF/ANSI Standard 42 Graded-density filtration + high dirt holding capacity. Extruded activated carbon provides several times greater life than molded filters. MADE IN USA 0.5 µm Nominal Filtration