After years of multiple repairs to their iron filter, heavy corrosion finally caused the replacement of the unit for the City of West Bend, Iowa. ISG prepared plans for a new factory built unitized aeration/detention/ filtration unit. This was the first all aluminum filtration unit constructed in the State of Iowa. The tank resists corrosion and provides maintenance free service. In addition, a large portion of the piping was replaced with PVC piping, which will also provide a more maintenance free system. The treatment plant now removes iron and manganese to below secondary MCL limits.