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The Air Products' Halia® modular aeration system consists in the combination of a VSA (Vacuum Swing Adsorption) oxygen generator integrated with a low energy mixer aerator. The mixer is mast-mounted allowing easy installation and access. The VSA is based on robust rotary-lobe blower technology. Together they form a novel, efficient, yet easily maintained package capable of delivering dissolved oxygen to any wastewater basin or oxidation tank.