The Pentek DBC-10EX2 Bacteriostatic KDF/GAC Water Filter is 10-inch L x 4.5-inch W. The filter can be used in all number 10 Big Blue or number 10 Big Boy housings. The Pentek DBC-10EX2 water filter cartridge has 2 lbs of KDF. The Pentek DBC-10EX2 GAC/KDF filter cartridge contains KDF-55. The Pentek DBC-10EX2 water filter reduces chlorine taste and odor water-soluble heavy metals and controls scale bacteria and algae in your water. KDF is a patented medium that consists of high purity copper-zinc granules that use redox exchange of electrons to effectively reduce chlorine and heavy metals as well as controlling microorganisms in potable water. The Pentek DBC-10EX2 water filter recommended flow rate is 2 gallons per minute. Alternate Part Numbers: 255748-43 255748 KDC55-03-10BB AF-10-2013-BB FC25574843.