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Re: [compost_tea] Pumping air in is not the best way to aerate your tea



This should be easy to check with a DO meter.
However, circulation of the water vertically must ensure a reasonable
distribution of oxygen throughout.
And o2 will dissolve at any air-water interface : the surface area of
the bubbles could vastly exceed the area of the top of the container.

What you say about fish is true where (1) there is no vertical
circulation of the water, and (2) the o2 is depleted.  
Well, guess what?  No bubbles in the tank -> depleted DO. Bubbles in
tank -> happy fish!

Unless of course you are basing your email on some scientific
experiments, please explain!

Lynton
"elprune " wrote:
> 
> Very little oxygen is actually dissolved from the air bubbles. Most
> exchange takes place at the top where the air/water interface is.
> This is done from movement of the water at the top and that's where
> most of the dissolved oxygen is.
> 
> When a fish in a poorly aerated tank is gasping for air, why do you
> think it goes to the top.
> 
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