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 Hi Jason, 
The equipment that generates the fine bubbles for fish tanks 
does not achieve 20 micron bubble sizes, so the application is not the 
same.  The track record of the Aerob-a-jet working with aerobic bacteria in 
the sewage treatment industry doesn't remotely suggest a problem with too much 
air in suspension in the water.  In fact, it shows that there is a 
significant benefit in the performance of the aerobic bacteria.  So, there 
seems to be a contradiction between what the Aerob-a-jet people are saying and 
what Elaine is saying.  I believe it is worth some investigation.  It 
seems to me that DO has a limit no matter how many bubbles are present.  I 
don't know where she came up with the idea of more air than water because the 
micro-bubbles are so small one can't easily see them.  That sounds and 
looks like a lot more water than air.  I remain skeptical.  It would 
be interesting to see Elaine's data on her experiments with fine bubbles, but 
then I'd still wonder about the micro-bubbles which are different than fine 
bubbles.  On the Aerob-a-jet web site, they cite quite a few people doing 
successful experiments with the Aerob-a-jet.  Perhaps some of those could 
shed a little more light on the use of micro bubbles?  The way I read what 
Elaine wrote, the aerobic bacteria don't like such an environment, but the 
Aerob-a-jet people claim the aerobic bacteria do well in such a setting.  
 
Thomas Giannou 
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