Pentek DGD-2501-20 Water Filter Replacement Information: The Pentek DGD-2501-20 water filter is easy to install in whole house systems or commercial water treatment systems. Replace the Pentek DGD-2501-20 sediment water filter cartridge every 2 months or 8,000 gallons of water. The filter change interval also depends on your water supply and water usage. Pentek DGD-2501-20 Water Filter Housings: For use in Ametek, US Filter, Culligan 20″ Big Blue housings. The following Culligan, Ametek, USFilter, and Plymouth Products model holds the Pentek DGD-2501-20 sediment water filter cartridge: #20 Big Blue. The Pentek DGD-2501-20 Sediment Water Filter Cartridge also fits Cuno AquaPure, Omni, Sears, Fulflo, Teledyne Water Pik, Ace, Master Plumber, Flotec, Honeywell, General Electric, American Plumber, and most other water filter housings for 20″ x 4.5″ filters. . .Pentek DGD-2501-20 Water Filter Specs: Type:Dual Gradient Density Dimensions:20″ x 4 1/2″ (254 mm x 114 mm) Pre-Filter Micron Rating (Nominal):25 Post-Filter Micron Rating (Nominal):1 Temperature:40?F to 145?F (4.4?C to 62.8?C) Initial ΔP (psi) @ Flow Rate (gpm):DGD Series Dual Layer Filters Comparison ChartWATER FILTER MODELS MICRON RATING (Nominal)10″ x 4.5″ 20″ x 4.5″ Pre-Filter Post-FilterDGD-2501 DGD-2501-20 25 Fine 1 Extra-FineDGD-5005 DGD-5005-20 50 Medium 5 Medium-FineDGD-7525 DGD-7525-2075 Coarse 25 Fine (Package Of 3)