Wastewater Treatment tools and resources Software ToolsAeration & Pumping Savings EstimatorStatepoint AnalysisOUR Data Entry and CalculationReference BooksActivated Sludge Wastewater Treatment: Process Control & Optimization for the Operations Professional, by Eric J. WahlbergWastewater Engineering: Treatment and Resource Recovery, 5th Edition, by Inc. Metcalf & Eddy, George Tchobanoglous, H. Stensel, Ryujiro Tsuchihashi, Franklin Burton