MountainFlow Refrigerator Filter creates better tasting water for drinking as well as clean, clearer, healthy ice. It reduces chlorine taste and smell, remove 97% of lead and 24 contaminants. (Fluoride, Sediment, Heavy Metals & Chemicals, Micro-organisms, Chlorine, Taste and odor, Lead, Mercury, Cysts, Particulates (Class I), Asbestos.) The Filters’ lifespans are determined by various factors, such as water quality and level of contaminants. But for the best filtering result, replace the fridge filter every 6 months or after it filters 300 gallons of water. If you have any problem with the filter, contact us anytime. What we do is to offer better services for you.