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To raise calcium by 20 ppm in 100 L: 54.1 ml.
500 g x 0.2726 / 0.1829 = 745 g hexahydrate per US gal for the same Ca as Recipe #1.
• Only ~18.3% Ca: using dihydrate numbers with hexahydrate under-doses by ~33%.
• Deliquescent: may already have absorbed extra water; verify stock with a Ca test.
745.1 g made up to 1 US gal total.
reefkeeping.com/issues/2006-02/rhf/index.php