Is it possible to not need C02 based on your PH and KH readings? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 11-28-2016, 07:37 PM Thread Starter
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Is it possible to not need C02 based on your PH and KH readings?

As the majority of you know there is a direct correlation between your PH and your KH readings. When you have them both just right should indicate enough C02 is present in the water. Is it possible to obtain this without C02? I am curious because my readings are close and only require minimal PH reduction in order to get to the sweet spot for c02.

Any help appreciaated?
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post #2 of 4 (permalink) Old 11-28-2016, 08:30 PM
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If you are using anything to bring pH down, like peat moss, chemicals, tannis the chart won't work. Actually it's more or less worth nothing, it assumes we have "clean" water, anything that changes pH without changing KH will make the chart irrelevant.


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post #3 of 4 (permalink) Old 11-28-2016, 08:31 PM
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Originally Posted by easttech View Post
As the majority of you know there is a direct correlation between your PH and your KH readings. When you have them both just right should indicate enough C02 is present in the water. Is it possible to obtain this without C02? I am curious because my readings are close and only require minimal PH reduction in order to get to the sweet spot for c02.

Any help appreciaated?
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post #4 of 4 (permalink) Old 11-28-2016, 08:34 PM
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There is no way to reliably infer CO2 concentration from pH and kH readings. The tables assume that your water only contains CO2 and a pure base such as CaCO3.

In practice the substrate, driftwood, decomposing matter, etc all contribute organic acids and buffers which influence pH. If your tank contains nothing but inert rock and is spotlessly clean, the table can be usable. Otherwise use a drop checker.


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