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Old 10-30-2015, 05:19 AM   #11
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Decided to buy a LaMotte test kit to tell how much Ca and Mg the Oyster grit is adding.

Soaked a small handful well rinsed oyster grit in RODI water for 5 days.
Results were 37 ppm Total Hardness. Calcium results were 24 ppm. From this we can extrapolate Mg is 13 ppm. So about a 2 to 1 ratio of Ca to Mg. It is still much more Mg then I expected. If I ever get any more crushed coral I will run the same analysis to see if the ratio is any different.

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