IRON RESIN Sale! from $ 24.60 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Replacement Resin for your Gravity-Fed Iron Water Bottles. Removes harmful impurities and hard-water deposits in your water supply to keep your iron in good working condition. Resin particles changes to an amber color letting you know when its time to change Removes calcium & magnesium. Longevity of resin depends on how often the iron is used and type of water being used. Store in a cool, dark place. 14 oz per bag. Tweet