A biological method of removing nutrients is the SBR process. Multiple tanks can be included in an SBR system design to accommodate the requirements of an industrial or municipal wastewater treatment facility. A single SBR tank typically functions as a plug flow or a completely mixed reactor. The decanter is powered by an electromechanical actuator system, which allows it to continually release cleared effluent at a steady rate. Additionally, some SBR systems include a bio-selector for separating bacteria and solids.