The Planted Tank Forum - View Single Post - Need advice - algae and nitrate problem in planted tank
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Old 01-05-2013, 04:52 PM   #20
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You calibrate your API kit by testing it against a known amount of Nitrate.

And about the API instructions: shake the reagent solutions in the bottle (for nitrate) for longer than recommended. For at least a minute. Many times that will help.
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