GFS Wastewater Treatment Tank: Applications Across the Plant A GFS wastewater treatment tank is a Glass-Fused-to-Steel (GFS) bolted vessel used at multiple stages of a plant, from equalization to clarification. The enamel fused at 820-930°C resists the pH swings, abrasives, and biology that destroy painted steel. Engineered by Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), these tanks carry the same proven coating from the headworks to the digester. What a GFS