The In-Situ Oxygenation (I-SO) System from Praxair offers the benefits needed to overcome many wastewater treatment challenges. The system is a mechanical oxygenator that can dissolve as much as 82 percent high-purity oxygen into water. When a facility aerates with the system, it can increase biotreatment capacity, significantly lowering VOC emissions, reducing foam formation, reducing electrical power usage, and allowing for greater variations in oxygen demand. 800/772-9247; www.praxair.com/wastewater; Booth 651