[Kalkbreath]

When DOW states that the new Calcium flake contains 7,000. ppm bromide, does this mean that for every 1,000,000 calcium parts there are seven thousand bromide parts?

And when Instant Ocean states that their product contains 70 ppm bromide..... Does this mean that their product ( the dry salt) contains 70 ppm bromide or that their product after its mixed with water? (at the correct salinity) contains 70ppm bromide?

If a bag of IO contains about four pounds calcium and a hobbyists adds about four pounds of high bromide calcium to replace calcium lost in their aquarium (through calcium supplements). ... what is the math to compute new level of bromide.

Seawater = 67.3 bromide parts per million total parts in ocean water.

If seven bromide parts for each 1,000 calcium parts = new DOW

and I add four pounds of this new DOW calcium to a fifty gallon aquarium over the course of a few months to replace calcium used up by the systems inhabitants. And I know that four pounds of calcium in fifty gallons of water yields a product of 360 ppm calcium.

What is the new Bromide level ?(assuming that none has been removed) The new bromide plus the original which came in with the IO seasalt.

Would the added bromide still be at the same ratio as it was when it was dry flake?

Then this would translate into the added bromide content still being one 7000th of the calcium.

One 7000th of the 360 ppm calcium would be less then one-tenth ppm. so the bromide level would have been raised by the new DOW calcium by a tiny less then one ppm .