The system operates by pumping a side stream of raw, unscreened wastewater through a conical shaped oxygen transfer reactor. The small sidestream pump pulls a portion of the main flow and overcomes the head loss through the cone to reintroduce the SuperOxygenated wastewater into the main line or body of water. Gaseous pure oxygen is metered into the cone which has an exceptionally large gas/water interface generated by the bubble swarm to achieve rapid SuperOxygenation. The ECO2 SuperOxygenation system completely dissolves the gaseous oxygen into the wastewater before it is blended back into the receiving body. There is no internal baffle matrix or static mixer that could collect rags or stringy material.