Neenah Wastewater Treatment Plant felt that uniform wall, crosslink polyethylene tanks made by Assmann would stand up better to the chemical attack of the sodium hypochlorite.
Peichl knew that in time the sodium hypochlorite would eventually attack the tanks, and they would need replacing, but usually this happens after many years. These types of problems should not have happened within one year. The installation contractor and manufacturer were asked to replace the tanks under warranty. After repeated attempts to get the contractor and manufacturer to do this, the problem was not resolved.
Peichl couldn't wait to resolve the problem because of the environmental issues they imposed. He tried plastic welding the tanks without success. Next, Peichl asked John Pfeiffer, owner of Fiberglass Technologies, a representative of Assmann Corporation of America, to review the problem. Pfeiffer recommended cutting out the area around the fitting, where the cracks were, and installing a larger fitting. The tanks cracked again beyond the larger fittings.
Since this didn't work, his next recommendation was to replace the tanks. Pfeiffer felt that uniform wall, crosslink polyethylene tanks made by Assmann Corporation of America would stand up better to the chemical attack of the sodium hypochlorite. Neenah Wastewater Treatment Plant purchased three 5,200 gallon vertical tanks from Assmann Corporation to replace the 7,000 gallon tanks.