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#1
01/14/2005, 10:38 AM
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CA drop when ALK is raised?
How much does CA drop when ALK is raised with baking soda? So if I had ALK of 2 meq/L and CA of 400ppm and wanted to raise my ALK by 1 meq/L, using about 3 tsp of baking soda in a 100 gal system, how much would my CA drop?
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#2
01/14/2005, 02:03 PM
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Calcium wouldn't drop at all when you first added the baking soda.
When that alkalinity is consumed by corals or through precipitation, calcium will drop by about 18-20 ppm Ca++ for each 1 meq/L of alkalinity. The exact ratio for calcium carbonate is 20 ppm Ca++ per 1 meq/l of alkalinity, but since magnesium and other ions can get into the CaCO3 in the place of calcium, the number is a tad under 20 ppm. I discuss such issues in this article: When Do Calcium and Alkalinity Demand Not Exactly Balance? http://reefkeeping.com/issues/2004-12/rhf/index.htm
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Randy Holmes-Farley |
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