Replacement WD-WF10-FG for Whole House 2-Stage Filter WD-WHF21-FG – Reduces Iron & ManganeseModel WD WF10 FG Size 10 * 4. 5 Filtration accuracy 5 microns Working termperature 4~38C 40~100F Working pressure 25~90 psi Filter capacity GAC filter: up to 6 months PP filter: 3 6 months Professional For Reducing Iron And Manganese The human body needs iron and manganese as trace elements. Fortunately, they are present in drinking water, but sometimes in excess. Excessive intake of iron and manganese is harmful to the body as chronic liver poisoning