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Yes, it means for every one million parts by weight of total product, there are 7,000 parts by weight of bromide.
So the amount of bromide added is about 7,000/1,000,000 times the total weight added.
or
the amount of bromide added is about 7,000/280,000 times the amount of calcium added. So for a 100 ppm rise in calcium, that is 100 x 7,000/280,000 = 2.5 ppm.
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Randy Holmes-Farley
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