Re the article from Taunton's: I think since that article was published that there has been a lot of research that make it "obsolete." I started with "that" machine and several of my first ones were constructed using air stones and small pumps.The problem is the size of the bubbles....may be too small and the inadequate air supply. It is a good place to start, but not to remain very long, IMHO!Cheers,Jeff L
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