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Randy, not to be a pain in the behind on the #'s, but if anyone ever does some calculations for accumulation/consumption/dilution by water changes, etc. of the bromide, I thought it might be worthwhile to nail the numbers down.
If using Dowflake 77-80% calcium chloride, if you assume 78.5% calcium chloride. Since anhydrous calcium chloride is 36% calcium by weight, then Dowflake itself is 28.3% calcium. To boost a tank 100 ppm (mg/l) in calcium then requires 353 mg/l of Dowflake. Since the new Dowflake is estimated by Dow to be 7,000 ppm by weight bromide, that's 0.7% by weight bromide. 353 * 0.007 = 2.5 ppm (mg/l) bromide or about 3.7% increase assuming bromide in NSW is 67 ppm.
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