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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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