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Old 11-26-2012, 08:12 PM   #4
Darkblade48
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As Hoppy mentioned, we use agricultural grade, but if you have access to lab grade, then all the better.

I use lab grade chemicals to make my 4 dkH reference solutions for my drop checkers.

As for ppm versus molar concentrations, it might be due to a combination of convention (whoever started it) and ease of expression; now, we can say x ppm of nitrates are required as opposed to y M(olar), etc.

The chemist in me understands your confusion though
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