Subsurface aeration is where the oxygen is not added via agitation and splashing at the surface, but by bubbles rising from a source at the pond bottom. As the bubbles rise they contact the water and some grow while others burst. The bursting bubbles act like millions of mini agitations that add oxygen while the growing bubbles will drag up water from the bottom to the top. Subsurface aeration is a great tool to fight lake stratification and eliminate layers in temperature and zero oxygen or “anoxic” zones. Because air bubbles will rise naturally on their own, subsurface aeration systems are very energy efficient without having to fight the forces of nature to circulate water. Stratification is a potentially deadly problem for life in your water body because buildups of organics can create deadzones that when stirred up can rob the water of available oxygen. A good example is after heavy rain when the cool denser rain droplets go to the bottom and stir up the anoxic layer. The lack of oxygen in this layer will then quickly take up any available oxygen in the upper regions of the water body and consequently cause a sudden drop in available oxygen.

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