AF Series cartridges are double-open end cartridges that fit standard residential and industrial housings. Cartridges is a 2-1/2" diameter and 20" length. Using premium Resintech media and offering oversized cartridge cavities, AF Series cartridges provide the best in water purification and filtration. The AF Series provides effective Arsenic reduction by utilizing advanced media technology of ResinTech?s ASM-10-HP Arsenic selective media has unsurpassed capacity and is effective over the entire pH range of potable water. In cartridge form, the AF Arsenic Removal Series is an ideal choice for POU applications requiring EPA compliance of less than 10 ppb of arsenic. Model Dimensions Flow Rate (GPM) Capacity (gal) Operating Maximum AF-20-3695 20" x 2.5" 0.5 0.75 4,000