KH and CO2

aquabillpers

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Jan 24, 2005
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I have a simple question.

A 10 gallon aquarium without CO2 injection has a KH of 2 degrees. A certain amount of CO2 from the atmosphere has been absorbed by the water.

If the KH is increased to 12 degrees, will the number of CO2 molecules in the water remain the same?

(I'd think that it would, but somewhere I think I read that high levels of carbonates will combine with CO2 and reduce the amount of it in the water.)

Thanks.

Bill
 

Philosophos

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Mar 12, 2009
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It'll stay the same for the most part. There might be some little alterations from the changing viscosity, but nothing like what you see for indication on KH-pH-CO2 charts. Those charts created the misconception of altering CO2 through KH because of some simple misunderstandings on the part of readers.
 

Tom Barr

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Jan 23, 2005
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The KH and the pH will increase.
The CO2 should remain the same(none is added or removed assuming the system is equal to the parital pressure of CO2 in the air).

Regards,
Tom Barr
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