Product Description The EcoPure string wound filter (2 pack) reduces sediment, sand, silt, and rust, which will extend the life of water using appliances. These filters fit most other brands of whole house water filtration systems. The EcoPure string wound universal filter is compatible with GE, Whirlpool, Culligan, Omni, DuPont, Filtrete, 3M, Watts and most standard size water filtration systems. These filters are NSF certified and filter down to 10 microns and work great on both well water and municipal water supplies. From the Manufacturer String Wound Whole Home Replacement Filter. 10 micron rating. Removes sediment. String wound construction. to fit all major brands.