Tier1 Replacement for GE MSWF SmartWater, 101820A Refrigerator Water Filter DESIGNED TO FIT: GE models that use a plastic twist & lock water filter located in the back upper right corner, inside the refrigerator NSF 42 CERTIFIED: Each Tier1 refrigerator filter is tested and certified for materials and structural integrity requirements HIGH EFFICIENCY FILTRATION: Reduces Chlorine Taste & Odor, Rust and Corrosion, Sand Sediment, Silt, and Turbidity for 300 gallons or 6 months, depending on water usage and quality REPLACEMENT MODEL: This is a replacement comparable part to MSWF, WF282, EFF-6022A, AP3997949, RF-G2A, SGF-G23, PC46783, MSWFDS, and 101821B 100% TIER1 NO WORRIES GUARANTEE: We stand behind the quality of filtration and overall performance of our Tier1 filters! Chlorine Taste and Odor Rust and Corrosion Sand Sediment Silt Turbidity Shut off water supply Twist the old filter a quarter-turn counterclockwise and remove Insert new filter into the refrigerator receiver, push the new filter until it stops Twist the filter a quarter-turn clockwise Reset water filter status display Flush filter with 3-4 gallons of with water until water runs clear. Some noise is not uncommon as air is purged from the system. If filter sits for several days without use, flush a quart of water through the filter to remove stale water from refrigerator water lines