More oxygen is added to the water through the surface film/air intersection than from the bubbles of the aeration system.

That's why the lifting rates in GPM of the diffusers is so important. The more water volume that is exposed to the air, the more O2 added.

That's why surface agitators do such a good job adding O2. MUCH more surface area of the water comes in contact with the air. But then you get into the electricity costs vs. amount of O2 added debate.

Both types of systems have their place, it's up to the pond owner to decide which one (or both) to go with.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).