WHIRLPOOL Standard Capacity Whole House Filtration Replacement Filter (2 Pack) WHKF-GD05 (Packaging May Vary) Reduces sand, soil, silt, sediment, and rust Rigid cartridge construction and grooved surface for increased surface area 6 month filter life; 5 micron nominal filtration Fits Whirlpool WHKF-DWHV and many major brands of standard capacity whole home water filtration systems (2.5" x 10" systems) Tested and certified by NSF International against NSF/ANSI Standard 42 in model WHKF-DWHV for the reduction of Particulate Class V