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Ladders at Water and Wastewater Plants A water or wastewater plant is a wet concrete campus with chemical rooms, clarifier walls and basin railings, and almost every ladder on site is fiberglass for a reason. Aluminum conducts, corrodes and gets condemned after a few years of washdown. Why Fiberglass, Not Aluminum Plant work mixes water, chlorine, caustic, polymer and electrical equipment in the same buildings. Aluminum is a conductor, and even where the work is not electrical, washdown water c …