Case Study: South Bend, Indiana Targeting Iron And Manganese In Drinking Water

The South Bend, Indiana Water Works supplies drinking water to 120,000 people in St. Joseph County, including 98,000 residents of the City of South Bend. An essential part of South Bend's overall treatment train is its Pinhook filtration plant, whose gravity filters have relied on manganese greensand to remove iron and manganese from its groundwater source since 1998. During a routine filter maintenance overhaul in the spring of 2004, operators at South Bend found that manganese greensand levels in each of the plant's eight gravity filters were a bit low. The utility decided to replace the greensand in the eight filter with Calgon Carbon's CalMedia™ GSR Plus to evaluate its performance against both manganese greensand and a silica sand filtration unit it operates at another facility