This Filtrex FXB20RFL Water Filter is a radial flow 20 inch Big Blue GAC filter cartridge for the reduction of the bad taste and odor of chlorine as well as dirt, sediment, rust, and other impurities down to the 20 micron level. It is compatible for use in all water filter systems and filter housings which use a 20" length x 4.5" width (Big Blue) water filter cartridge. The Filtrex FXB20RFL is one of many eco friendly filters from the RFL Series of GreenBlock filters from Filtrex. These high performance coconut shell granular activated carbon block water filter cartridges are manufactured using a unique process that reduces harmful green house gas emissions. This Filtrex GAC filter cartridge is made from high performance coconut shell activated carbon which features a unique carbon binder system plus more micro pores compared to other types of carbon filters. Filtrex carbon filters have a very low pressure drop, high dirt holding capacity, and advanced contaminant reduction due to more carbon surface area in the filter. No carbon fines are released during filtration. Filtrex Radial Flow filters can be used for a wide range of POU, POE, residential, commercial, and light industrial applications. With sturdy polypropylene end caps, polyester inner/outer wrapping, and a polyethylene netting, these Filtrex filters are durable and designed to last. The Big Blue diameter (4.50") of the Filtrex FXB20RFL allows for a higher flow rate and longer filter life than standard 2.75" diameter filters. Specifications: Gaskets: NBR Pressure Drop: 1.0 PSI Micron Rating: 20 microns Temperature Range: 40 - 180 F Filter Life: About 40,000 gallons Dimensions: 20" length x 4 1/2" width Filter Media: Coconut shell GAC carbon block Removes/Reduces: Chlorine taste and odor, dirt, sediment, rust, etc. Flow Rate: 3 gallons per minute @ 1.0 PSI (may vary depending on specific water filter system) This filter is NSF Certified to Standard 42 for Material Safety and is also manufactured from NSF Standard 61 Certified coconut shell carbon. Additionally, it is NSF / WQA Gold Seal Listed.