This refrigerator water filter is used in select Samsung French door and side-by-side refrigerators with filter access inside the refrigerator. While retaining beneficial fluoride, this NSF® Certified refrigerator water filter reduces cysts, chlorine taste and odor, particulates (Class I), lead and mercury. Replace your Samsung Refrigerator water filter every 6 months to ensure clean, safe drinking water. For added convenience, all Samsung refrigerators with an external dispenser have an indicator light on the display that reminds you when it’s time to replace your water filter.