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4 O tterbine offers a variety of aeration systems including aerating fountains, industrial aerators and subsurface diffused air systems. Choosing the right system is critical and depends on the amount of aquatic vegetation, the visual effect desired and the available power. When determining aeration vs. aesthetic, know that aeration systems need to provide a minimum of 2.2lbs. or 1kg of oxygen per horsepower hour, and Otterbine ® Aeration Systems TreatingWater Above & Below the Surface