The Pentek filter is a 20 micron sediment water filter, The Pentek water filters reduce sand, sediment, silt, rust particles, and scale particles, The Pentek filters have pleated walls for dirt-holding capacity, The Pentek water filters are recommended for chlorinated water supplies, The Pentek is NOT recommended for wells, Use the P20-10BB-WF filter for non-chlorinated water supplies, The Pentek water filter media is pleated around a polypropylene core for added strength and the ends are immersed in a thermo-setting vinyl plastisol, The Pentek has gone through a manufacturing change and no longer has an external netted sheath, Dimensions: 9, 75"" x 4, 5"" (248 mm x 114 mm), Micron Rating (Nominal): 20 Micron, Temperature Rating: 40F to 145F (4, 4C to 62, 8C), Initial ?P (psi), Flow Rate (gpm): 1, 2 psi, 10 gpm (0, 08 bar, 38 L/min), Surface Area: 2070 sq, in, (1, 34 sq, m, ), Recommended Flow Rate: 20 gpm (76 Lpm), Pentek S1-BB Sediment Filter Materials of Construction:, Filter Media: Resin-Impregnated Cellulose, End Caps: Vinyl Plastisol, Core: Polypropylene, SKU: CWD1687