H2Flow SBR (Sequencing Batch Reactors) utilizes a built on site steel bolted tank and a 5 stage process for treatment of wastewater. The first is the idle stage, waiting for the wastewater. This is followed by the fill stage, which has both anoxic and aerated cycles. The aeration stage then starts when the tank is full. The fourth stage is the settling / clarification. The fifth and last stage is the decanting stage, where the treated and clarified water is discharged from the SBR tank.