Check the listing for details. Pentek DGD-7525-20 Dual Gradient Filter, 25 Micron. Condition: New. Listed at 33.95 USD. The Pentek DGD-7525-20 fits the following water filter system housings:American Plumber Culligan Pentek Ametek Other 20 inch Big Blue Housings The Pentek DGD-7525-20 Dual Gradient Filter, 25 Micron is a replacement water filter cartridge that operates as a pre- and post-filter, eliminating the need for step-down filtration systems in your home. The outer layer of this Pentek water filter is a 75 micron pre-filter that captures larger sediment, reducing the load on the 25 micron inner-layer post filter, which allows it to operate more efficiently and consistently. The pure polypropylene construction of this 25 micron water filter is resistant to chemicals and corrosion. Pentek DGD-7525-20 Dual Gradient Filter, 25 Micron Specifications:Part Number: DGD-7525-20 Reduces dirt, rust and sediment 75 micron pre-filter/25 micron post filter Pentek part number 155356-43 Flow Rate: 20 GPM @ < 1 psi Dimensions: 4 1/2 inches x 20 inches Capacity: 8,000 gallons NSF 42 Certified For Material Requirements Only Temp Range: 40 - 145°F The life of this 20 inch water filter varies depending on usage and water quality.