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Bubbles from an airstone or diffuser transfer very little air into the water on their way up. Aeration is all about increasing the water SURFACE area. Bring the bottom water to the top, bring the bottom water to the top and you are increasing the SURFACE area hugely. It'll all about the interface of water surface and air.
Rest assured, the open pipe method of aerating a pond works great and you are not loosing air capacity by running your airblows at a positive back pressure with airstones . Waisted energy and short lived equipment costs money.
Maurice.
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