The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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Old 11-04-2012, 01:00 PM   #8
mistergreen
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The 30 ppm stems from the kh ph chart that been passed around aquarists

I'll have to find the exact definition somehow. Well either way I'll just read atmospheric co2 inside a permeable container and not worry about math co2 in the water.
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