This Pentek FloPlus-10 carbon block filter cartridge reduces fine sediment, chlorine taste and odor, and protozoan cysts in residential drinking water. It has a nominal (85-percent) filtration rating of 0.5 micron, and 99.95-percent efficiency for the reduction of protozoan cysts. It will reduce free available chlorine (FAC) at 2 parts per million (ppm) by at least 90-percent in up to 10,000 gallons at a flow rate of 1 gallons per minute (gpm). This cartridge is made of modified bonded powdered activated carbon (PAC) filter media that provides efficient cyst reduction with a flow rate and dirt-holding capacity comparable to those of a 10-micron filter. The Santoprene (TPE, thermoplastic elastomer) gaskets seal the cartridge against the housing (sold separately) . The cartridge has an initial pressure drop of 2 pounds per square inch (psi) at a flow rate of 1 gallon per minute (gpm), and operates over a temperature range of 40 to 180 degrees F (4.4 to 82.2 degrees C). This carbon block filter cartridge meets National Sanitation Foundation/American National Standards Institute (NSF/ANSI) standard 53 for quality assurance, and is used for purification of residential and commercial drinking water. Water filters remove undesirable particles, chemicals, and microorganisms from water by means of a semipermeable barrier, adsorption, or biological processes. They are made of densely packed synthetic or natural fibers that trap suspended particles, materials that block microbes or adsorb unwanted chemicals, or substances that cause a chemical change, such as acid neutralization. For most residential, commercial, and industrial applications, water filters are manufactured in the form of replaceable cartridges that fit inside permanent housings. Filtration systems typically consist of a series of two or more types of filters, each designed to remove different contaminants. The performance of filters is measured by the minimum particle size that is blocked, the percentage of particles or microorganisms that are removed, th

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