Refrigerator Water Filter Compatible models: Please browse in Picture 2 NSF CERTIFIED: Tested and certified by NSF International against NSF/ANSI Standard 42,helps reduce and/or remove chlorine tastes and odors making the water you drink more refreshing. Good Quality at Half Price: Even better filtration effect for you to enjoy superior water quality. Replace filter every 6 months or 200 gallons to maximize contaminant reduction Glacier Fresh Guarantee: If you are not satisfied, please contact us. We will give a full refund or replace the new filter for free.You will not lose anything.Bringing healthy water to you is the lifelong mission of the glacier fresh.