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    How do you find out what the amount means in regards to water quality?
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    This wikipedia link seems to be what you are after:

    http://en.wikipedia.org/wiki/Wastewa...ity_indicators

    It stresses the equation
    Oxidizable material + bacteria + nutrient + O2 → CO2 + H2O + oxidized inorganics such as NO3 or SO4
 
 
 
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