CO2 depletion
Is your test kit fairly new? Mine allows doubling the accuracy by doubling
the
amount of water. Does yours?
You can do this with all "KH" test kits. It's really just a titration for
alkalinity down to pH 4.2 or somewhere near there (forget the exact
indicator they use).. so double the volume and you double the ammount of
acid needed to hit this endpoint.
Jeff Ludwig
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