Reach for the Pentair Pentek RFFE20-BB Big Blue Iron Filter when it s time to change the filter in your 20 heavy duty whole home water filtration system. This filter is designed to provide an easy and effective method of reducing dissolved iron from your homes water which greatly improves the taste. Say goodbye to that pesky metallic taste for good. It also helps to eliminate the orange and brown stains often found in sinks toilets tubs and other plumbing fixtures. This filter minimizes the possibility of damage to pipes and other appliance by reducing up to 3PPM dissolved iron.