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I believe I have found a way to make an improvement on the recipe for Magnesium Water from M.O.M. I got to wondering about the undissolved layer of M.O.M. at the bottom of the bottle, and reasoned that the carbonic acid from the seltezer water must not be strong enough to dissolve all of the Magnesium hydroxide into solution, so I added some citric acid powder to the bottle, shook it up and sure enough, it foamed up and the white layer disappeared as the undissolved M.O.M. went into solution. That means that there is even more bio-available magnesium in the water than there was before. I did not measure how much citric acid I added this time, but the next time I make it, I will measure amounts of M.O.M., water and citric acid and should be able to come up with a pretty good guess at how many milligrams of Magnesium there are per ounce of water, if someone else doesn't beat me to it, of course : ) I love this site...home-made science in the public interest!