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[APD] Re:OUCH! Water so hard you could knock on it!
* From: David Terrell <Dave at terrellclan_com>
My tests have shown the water in my aquarium is 24 degrees GH, 4KH. I
tested the tap, which revealed 2GH/KH (I raised KH with baking soda).
I have natural gravel, a large lava rock and laterite. Filtration is
done by bio balls, and I use compressed CO2. What could be causing
this and how do I get it to a safer level?
If the GH is 24 and the KH is only four, that must mean that there is
a whole lot of CO2 dissolved in the water or that nearly all the GH
is due to non-bicarbonate calcium or magnesium salts, which would be
most unusual. Try letting the water stand in a shallow pan for a day
and then test KH. If it is not a lot higher, then all that GH must
be due to calcium chloride or calcium sulfate.
Paul Krombholz in sunny central Mississippi
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