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Yes, the increased calcium will raise the supersaturation some, but not nearly as much as the alkalinity did (because the 420 ppm only goes up to about 600 ppm in such a situation). That would make the omega for pH 6.8 about 1.4. So the real omega = 1 point will be a bit lower in pH (6.5-6.6 probably).
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Randy Holmes-Farley
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