This Pentek RFC20-BB carbon filter cartridge reduces chlorine taste and odor in residential and commercial drinking water. It is made of granular activated carbon (GAC) media with a spun polypropylene core and polypropylene end caps for strength and there is a nitrile butadiene rubber (Buna-N) gasket to ensure a watertight seal. The filter has a porous polyethylene 70-micron outer shell to reduce carbon fines and other suspended particles in the filtered water. It will reduce free available chlorine (FAC) at 2 parts per million (ppm) by at least 75 percent in up to 70 000 gallons at a flow rate of 4 gallons per minute (gpm). The filter has an initial pressure drop of 0.90 pounds per square inch (psi) at a recommended flow rate of 4 gpm and operates over a temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C). This carbon filter cartridge is used for treatment 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 the downstream concentration of unwanted chemicals the maximum flow rate and the amount of water that can be filtered before the filter must be replaced. Water filters are used in a wide range of applications including drinking water purification swimming pools industrial processes and irrigation among others. Pentair manufactures industrial commercial and residential water filtration components and systems. The company founded in 1966 and headquartered in Minneapolis MN meets International Organization for Standardization (ISO) standards 9001 and 14001 for quality assurance. Materials: Plastic Set includes: One (1) Replacement Water Filter Dimensions: 20 inches inches x 4.5 inches inches x 4.5 inches Care instructions: See Product Manual Reduces chlorine taste and odor in drinking water Granular activated carbon (GAC) media with spun polypropylene core and polypropylene end caps for strength Porous polyethylene 70-micron outer shell reduces carbon fines and other particles Initial pressure drop of 0.90 psi at a flow rate of 4 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C) Material: Plastic