The Omnipure (E5520) is a 1 Micron GAC filter cartridge. This filter also features a universal cap that fits all permanent existing heads which makes this filter easy to install and remove. This filter also aids in the removal of cysts, sediment, taste, odor and chlorine. Omnipure E5520 Carbon Block Water Filter Specs: Dimensions: 2.5" W X 10" L Rating: 1 Micron Rating Flow Rate: .5 GPM Maximum Pressure: 125 PSI Maximum Temperature: 100 F Service Life: 1 Year or 2500 Gallons Filtration Media: Carbon Block Reduces: Chlorine Taste & Odor Reduces: Cysts (Cryptosporidium & Giardia) Reduces: Particulates Class 1