Pond Boss Forums AERATION Systems questions Sweetwater aerator?

Sue - Good description how bottom aeration operates and I agree with everything you say above, BUT I take exception with: "actually the water is mostly reoxygenated by exposure to the air at the surface, not neccessarily by phytoplankton near the surface."

I am not sure how you arrived at believing this statement. Can you provide some proof? If you can provide some research or data then I will comment further about why phytoplankton is primarily responsible for oxygenating the surface waters compared to diffusion from the atmospheric air. "Reoxygenation of water by exposure to the air at the surface" has to occur primarily by diffusion unless you know of another method.