This Refrigerator Water Filter is used in Whirlpool®, KitchenAid®, and Maytag® side-by-side refrigerators with filter access in the base grille. Simply turn the filter 1/4 turn to remove and replace. 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. This package includes three Refrigerator Water Filters.