No Upset Apple Carts Here
If the CO2 alters KH is a matter of religious belief, if a Rabbi, Priest, Guru, Muftis, Preacher, Minister, Clergy person, religious leader tells you differently and you are a true believer accept what they say, I will not argue.
If it is not dogma to you than the simple fact is that CO2, or the small bit (~1/400) that becomes carbonic acid simply does not consume bicarbonate/carbonate hardness (KH).
However, the simple explanation of CO2/KH relationship is that the consumption of KH by any acid is actually the release of (phase change to gas) CO2 from bicarbonate/carbonate, carbonic acid (the names kind of give it away) take a carbon, leave a carbon, no net change. (Kind of stole that line from mattinmd.)
Without getting into the dual pKa thing, it should stop and make folks think that when we add 30-ppm CO2 (solvated) to our tanks we only produce about 75-parts-per-billion (ppb) carbonic acid yet can see a full unit drop in pH.
Anyway you are in good company.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.
Last edited by JoeRoun; 11-10-2014 at 03:54 PM.
Reason: (Kind of stole that line from mattinmd.)