im almost done with conversion i am trying to do overnighttest and im using like 75 drops to test this water to 15ppm? is this right on solution usage?
probably not if you are using a 25ml sample...you can cut down on that by more than half if you use one scoop of DPD powder and a 10ml water samle...then each drop will count as .5ppm instead of .2ppm...your way is more precise, but not really necessary.
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