Pentek DGD-5005-20 Compatible Filter, KleenWater PWF4520G-BB Big Blue Whole House Alternative Water Filter, Replacement Cartridge for Dirt Rust Sediment Filtration 4.50 x 20 Inch Poly-Spun Pentek Big Blue Alternative Water Filter Cartridge Compatible with Pentek Big Blue DGD-7525-20 (part # 155356-43), DGD-5005-20 (part # 155358-43), GD-5010-20BB (part # 555469-43), GD-7520-20BB (part # 555470-43) A High Quality, Low Cost Alternative to the Expensive OEM Cartridges 5 micron filtration