GE Appliances genuine water filters are certified to NSF/ANSI Drinking Water Treatment standards to improve the quality of your home water. Imitation or counterfeit water filters can damage your water filter system and aren’t guaranteed to reduce the impurities in your water. Genuine GE water replacement filter, MWF, reduces five trace pharmaceuticals, including: ibuprofen, progesterone, atenolol, trimethoprim & fluoxetine.* (*Impurities not necessarily in all users’ water).