Iron Resin 14 Oz.Iron resin is a self indicating resin filter that makes soft water by removing minerals, such as calcium and magnesium, found in water. By removing undesired minerals from water, it will prevent deposits to form inside the iron and greatly reducing the chances from getting clogged. Iron resin is specially intended for use in clear (see through) containers allowing to check on the changing color feature. The resin color change from dark blue to amber