The Planted Tank Forum - View Single Post - Drop Checker Color
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Old 03-05-2013, 06:02 PM   #5
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Right before CO2 turns on, do a pH test. After CO2 turns on and the drop checker stabilizes at the final color, do another. Remember the colors/readings.

Then you can do a pH test any time you want to get a relative (and unlike the drop checker, instantaneous) idea of how fast the CO2 rises and falls in your tank, and whether you need to turn on the CO2 earlier.
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