This Refrigerator water filter is used in Whirlpool and KitchenAid side-by-side refrigerators with filter access in the base grille. Simply turn the Refrigerator water filter 1/4 turn to remove and replace. While retaining beneficial fluoride, this NSF-certified refrigerator water 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. Replacing this Refrigerator water filter every 6 months ensures clean, safe drinking water.