The Harmsco HAC-BB-20-W Activated Carbon Water Filter Cartridge is a specially manufactured carbon filter. It has been made with innovative techniques that has high quality granular activated carbon. It is a replacement cartridge to be used with 20? Big Blue filter housing. The cartridge has a pressure rate of 6 psi and delivers high quality water to your homes. It comes with an impressive flow rate of 10 gpm, a flow rate of 5 microns and has a temperature range of 40 - 125 F. It removes the taste and odor that chlorine lends to water along with dirt, sediments, and rust. It measures 20" x 4.5" and has a capacity of 12,500 gallons. The replacement cartridge is NSF certified to ANSI-NSF Standard 42 for material requirements.