Certified to Reduce Lead, Sulfur, and 50+ Other Impurities | Replace Every 6 Months for Best Results | Pack of 1 It works with any refrigerator that currently uses GE RPWF or RPWFE filters. It is used in selected GE french-door refrigerators. Compatible with select GE french-door refrigerators. Reduces flavor-impacting impurities such as chlorine, lead, and more GE's most advanced filtration ever. Tested and verified to filter 5 trace pharmaceuticals including ibuprofen, progesterone, atenolol, trimethoprim, and fluoxetine ( The contaminants or other substances removed or reduced by this water filter are not necessarily in all users' water) Premium filtration: Certified to reduce chlorine-resistant cysts, lead, select pharmaceuticals and 50 other contaminants. Reduces 99% of Perfluorooctanoic acid (PFOA) and Perfluorooctaine Sulfonate (PFOS)