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Re: Calcium source

> From: Stephen Pushak <teban at powersonic_bc.ca>
> Subject: Calcium source
> what is a good chemical source of calcium that won't increase carbonate
> hardness? CaCl? Will it affect pH?

	CaCl2 will work, and will not affect the pH.  You will end
up with pretty high Cl- concentrations, 12.6 ppm for each degree
of GH.  I don't know if that would be a problem.
> do humic acids interfere with measurements of carbonate hardness? would
> it cause a positive or negative error in measurement?

	Any weak acid anion will cause a false high reading.  

Paul Sears        Ottawa, Canada