XWF Refrigerator Water Filter | Certified to Reduce Lead, Sulfer, and 50+ Other Impurities | Replace Every 6 Months for Best Results | Pack of 1 Models will now have an E on the sticker indicating the new counterfeit proof models. They will fit all existing units using a XWF filter GE fit - Compatible with select GE side-by-side and bottom-freezer refrigerators Premium filtration - Certified to reduce chlorine-resistant cysts, lead, select pharmaceuticals and 50 other impurities Lead removal - Lead is invisible, tasteless and odorless when present in water. Reduce lead with this under-sink filtration system Pharmaceuticals reduction - Reduces select pharmaceuticals, including ibuprofen, progesterone, atenolol, trimethoprim and fluoxetine. (Impurities not necessarily in all users water) PFOA/PFOS reduction - Reduces 99 percent of Perfluorooctanoic acid (PFOA) and Perfluorooctaine Sulfonate (PFOS)