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.
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.
Aerators for large ponds
The larger the pond the larger the aerator you’ll need.