Check the listing for details. Pentek NCP-20BB 20" Big Blue Water Filter. Condition: New. Listed at 49.97 USD. The Pentek NCP-20BB fits the following 20 inch Big Blue Water Filter Housings: American Plumber Ametek Culligan Pentek Pentair Plymouth US Filter others The Pentek, Ametek NCP20-BB 20 inch Big Blue water filter filters sediment as well as chlorine taste & odor. The NCP-20BB is constructed with carbon impregnated media--not cellulose--therefore providing resistance to bacterial attack which makes this filter eligible for use with non-chlorinated well water. The pleating of the Pentek NCP20-BB provides additional surface area to increase the dirt holding capacity and life of this filter. Pentek Part 155382-43. The Pentek NCP20BB Specifications: Reduces Dirt, Sand, Sediment Reduces Chlorine, Taste & Odor 10 Micron Rating Dimensions: 20 inches x 4 1/2 inches Flow Rate: 10 GPM @ 1 psi Temp Range: 40 - 125 F Chlorine Reduction Capacity: 1000 Gallons @ 4 GPM The NCP20BB should be changed every 6 months to 1 year based on water quality and usage.