Compatible to HYDRONIX-SDC-25-2005-4PK Sediment Filter 2.5" OD X 20" Length, 5 Micron by CFS Compatible to HYDRONIX-SDC-25-2005-4PK Sediment Filter 2.5" OD X 20" Length, 5 Micron by CFS . Removes Dirt, Sand and Silt. Appropriate for Well Water and City Water. 4) NSF Certified 5 micron sediment filters 5 Micron Poly Spun Sediment Filter Cartridge 2.5 x 20