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Re: Why does KH drop?

Plants may consume bicarbonates if the CO2 level is low.  Thus causing KH
to drop.  Using of peat or blackwater treatment will also reduce KH.  The
humic acid will react with the bicarbonates and reduce the KH.  Same with
driftwood, if they are not soaked enough, they will release tanins (humic
acids) which lowers KH.

BC (Singapore)