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Originally Posted by aquabillpers
So, to rephrase my question, if there was one glass on a table that contained water with a pH of 8.0 (and a GH of whatever), wouldn't it would contain relatively little CO2?
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No,why would it?
It would have the exact same CO2 ppm as the glass with a pH of 7.
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So I would surmise that only a small number of plants could be cultured at such a high pH, those few that could use the KH as a carbon source, such as vallisneria, sagittaria, elodea, and ceratophyllum. Right?
Thanks for the continuing turoring!
Bill
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No, there are many many plants that use bicarb. Myrio's, Swords, Egeria, Hydrilla, all pondweeds, vals, sag's that's not a few..........
The pH is not the issue, the CO2 and availability of alternate sources of carbon should that become low is.
From the pH/KH table=>
pH 7 and a KH of 1=> 3ppm CO2
pH 8 and a KH of 10 => 3ppm of CO2
They have the same CO2 and both are at about ambient levels.
Which has more *total* carbon?
The one with the higher pH.........now why?
Regards,
Tom Barr