Whirlpool 4396841 PUR Push Button Side-by-Side Refrigerator Water Filter, 1-Pack
It's NSF-certified to reduce cysts, particulates (class I), lead, mercury, and more. (The contaminants or other substances removed or reduced by this water filter are not necessarily in all users' water.) While it effectively removes contaminants from your water and ice, this filter also lowers the taste and odor of chlorine while retaining beneficial fluoride.
For the highest quality water and ice, your refrigerator's water filter needs to be changed over a period of time as its effectiveness at cleaning the water is reduced. For optimal results, you should replace this refrigerator water filter every 6 months to ensure clean, safe drinking water and ice.
Your refrigerator will even remind you when to change its filter, turning on an indicator light found near the water dispenser. Changing the filter is easy--just locate the old filter, twist and turn it until it becomes loose, then pull the old filter out and replace with the new filter.