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> Date: Fri, 2 Nov 2001 17:12:17 -0000
> From: "John Lawrence" <JRLawrence at cwcom_net>
> Subject: Re Nutrients Thomas Barr
> I have been reading inputs from Thomas Barr, and am trying to apply the
> advice to my problems.
> Two questions:
> As a source of phosphate I can only find K2HPO4 not KH2PO4 is this any good?
Yes. That is what I use.
> Will any of the chemicals suggested change the buffering hence invalidate
> the KH , PH CO2 relationship?
In principle, phosphate is about as bad as you can get for messing
it up. It's a very good buffer in the pH range we use. In practice, if
you stay down at 1 or 2 ppm, it won't be a significant problem.
Paul Sears Ottawa, Canada