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post #2 of (permalink) Old 11-26-2012, 03:12 PM
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Join Date: Dec 2005
Location: Sacramento, CA
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The dry chemicals we use are not lab grade chemicals, but agricultural grade. They are intended to be pure chemicals, with no intentional additives. I don't know why we use ppm concentrations vs. molar concentrations, but they aren't hard to do, until you add the complexity of expressing them in terms of a specific compound - like "carbonates as calcium carbonate".

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