This calculator estimates the concentration of free, or unionized, ammonia (NH3) in an aquarium
given the total ammonia (NH3 + NH4) concentration. See my Nitrogen-Ion Conversion Chart
for an explanation of the difference between NH and NH-N, but the short of it is that you should use "NH-N" as your Total
Ammonia Type if your test kit measures Total Ammonia Nitrogen (TAN).
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