Oxygen in a pond is critical to the biological processes, it’s especially important in warm water. The warmer the water the less oxygen it holds.
At the bottom of this page is a video I made on the benefits of oxygen in a pond.
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Aerators for small ponds
Small ponds can away with small cheap aeration units.
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Aerators for medium ponds
For mediums to larger recreational style ponds I like to use the type of aerator designed for septic systems.
These can also be used to create bubble pumps in swim ponds.
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Aerators for large ponds
The larger the pond the larger the aerator you’ll need.