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Re: KH measurements - what units?

1 KH = 17.9 ppm = 17.9 mg/l

Another favorite unit for some test kits (i.e., Hach) is grains/gal, or g/g:

1 g/g = 17 ppm = 17 mg/l

For the precision needed for our fish tanks, I treat the KH as g/g, allowing
a direct readout of KH using my Hach alkalinity test kit.

Anyway, for your reading of 60 mg/l:

60mg/l/17.9mg/l/KH = 3KH. Which is a little low if you are injecting CO2.
Augustine Rodriguez
Rice Lake, WI USA

> From: Joe Reiter <jreiter at bigfoot_com>
> Subject: KH measurements - what units?
> My KH/GH test kit measures (if I recall) mg/L of KH.  This means that I
> get results of numbers like 60.  However, it seems that everything I
> read refers to a KH of single digit numbers, like 6.  What is this
> number, and can I convert my mg/L readings into this?  (for handy uses
> such as finding the CO2 concentration based on KH and pH... all the
> charts seem to use the single digit KH measurement)
> - -joe