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Sorry, just realized that this experiment used atmospheric air, NOT pure O2. ...Oops! So, the results say: shaking carboy > any other method of using atmospheric air.

Did anyone else read this? It says that rocking/shaking can achieve 90% oxygen saturation in water about 5 minutes, far faster than even a diffusion stone and pure o2. I guess I don't need an expensive oxygen system and stone after all. (If you don't mind rocking/shaking a 5.5 gallon carboy...