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Noraml ?
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09/05/2007, 12:40 PM
bertoni
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Join Date: Mar 2002
Location: Foster City, CA, USA
Posts: 35,743
For every 20 ppm of calcium consumed, the tank's alkalinity will drop by about 2.8 dKH, which is consistent with your numbers. That rate of drop isn't all that surprising, but a magnesium test might be useful.
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Jonathan Bertoni
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