This Premium Push Button Refrigerator Water Filter is used in side-by-side refrigerators with filter access in the base grille. Simply press the release button to remove and replace the filter. This NSF Certified filter reduces cysts, asbestos, 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 4396711.