This Refrigerator Water Filter is used in bottom-mount refrigerators with filter access inside the refrigerator. Simply turn the filter to remove and replace. This NSF® Certified filter reduces cysts, chlorine taste and odor, particulates (class I), lead, and mercury. The contaminants or other substances removed or reduced by this water filter are not necessarily in all users' water. Replace every 6 months ensures clean, safe drinking water. Replaces UKF8001AXX, 67003523, 67003526, 67003527, 67003528, 12589203, 12589206, 12589208, 12589210, 13040216, 13040216N, & UKF9001.