Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20″ X 4.5″, 25 Micron. Reduces sediment and chlorine taste & odor to provide great tasting, clearer water. FITS ALL 20″ Pentair Pentek Big Blue or other 20″ heavy duty filter housings and can replace any 20″ x 4.5″ carbon filter cartridge. UNIQUE RADICAL FLOW DESIGN offers low pressure drop, while significantly reducing release of carbon fines commonly associated with GAC cartridges. NSF INTERNATIONAL tested and certified for your peace of mind. 100,000 GALLON CAPACITY. Replace every 1 year or when you notice a drop in water pressure or water quality. Pentair Pentek RFC Series Cartridges are constructed with a 70-micron porous polyethylene outer shell and durable polypropylene endcaps. The 2-3/4″ outer diameter cartridges have a polypropylene core and the 4-1/2″ outer diameter cartridges incorporate a spun polypropylene core. Sandwiched between the outer shell and the core is a bed of granular activated carbon (GAC). The unique radial flow design offers the benefits of granular activated carbon (GAC) filtration, such as low pressure drop, while at the same time significantly reducing the release of carbon fines commonly associated with GAC-style cartridges. Pentek RFC Series Cartridges are available in a wide variety of sizes and are ideal for point-of-entry (POE) and other high flow rate applications. 4.5 “h x 4.5 “h x 20.0 h. Weight: 2.5 lb. 20″ x 4.5″. 4.5″D x 4.5″W x 20H. This item is in the category “Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters”. The seller is “nstock4you” and is located in this country: US. This item can be shipped to United States.