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[compost_tea] Re: Alaska compost tea
>The measure of oxygen you want to use is oxygen concentration, not
>percent dissolve oxygen. You need above 6 ppm, or 6 mg O2 per L.
Just so we are on the same page:
Dissolved oxygen concentrations are most often reported in units of
milligrams of gas per liter of water - mg/L. (The unit mg/L is
equivalent to parts per million = ppm).
>At sea level, at 72 F, the typical oxygen concentration is around 9
>to 9.5 mg oxygen per L.
That looks like around 100% Oxygen saturation
>If you are reading dissolved oxygen versus dissolved carbon dioxide,
>you should have around 80 to 95% DO.
Streams with 90% Oxygen saturation or above are considered healthy.
Based on that, you would need around 8 ppm, or 8 mg O2 per L. at a
temperature of 72 F. to achieve 90% Oxygen saturation.
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