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Re: about KH buffering capacity
> Peat do not "invalidate" KH buffering capacity. Peat merely releases humic
> acids which will lower the KH. KH, pH and CO2 relationship do not get
It is possible for peat to invalidate the KH-pH-CO2 relationship. Peat can
do that by releasing weak organic acids into the water that can be measured
as part of the KH. The KH-pH-CO2 relationship assumes that all KH is
produced by bicarbonate. If that isn't true the the relationship is
incorrect. The effect causes the KH-pH-CO2 relationship to overestimate the
amount of CO2 in the water.
Some driftwood can cause the same effect.
While it is *possible* for peat (or driftwood) to invalidate the KH-pH-CO2
relationship it is by no means guaranteed. You probably shouldn't assume
that it happens. In fact I would guess that it happens a minority of the
time -- especially with drftwood. Significant problems are less likely if
your water supply is naturally well-buffered.