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RE: K,Ca, Mg
>Folks on this list report no problems with rather high potassium levels,
>but hydroponics literature does warn that potassium needs to be kept
>reasonably balanced with calcium and magnesium. If you plan to use
>potassium bicarb to add 3 or 4 degrees of buffer capacity (which would
>produce 42 or 56 ppm of potassium) then you might want to make sure that
>your water also has a couple degrees or more of GH.
I wise idea indeed. I tend to have a higher GH than most(GH 9). Perhaps lack
of this was Shawn Prescott's issue with high K+?