AquaPure AP817-2 by 3M Purification Replacement Carbon Water Filter Cartridge. Replaces AquaPure AP-815-2. Dimensions: 20 1/8” L x 4 5/8” W. 25 Micron Nominal Filtration Flow Rate: 20 gpm Dirt and Rust Reduction. Rigid Construction Withstands Stressful Conditions. Maximum operating temperature of 100° F. Made from FDA (CFR 21) Compliant Materials. Chlorine, Taste/Odor Reduction. Polyethylene Outer Shell, PolyKLEAN Center Core. Granular Activated Carbon.