As Myka stated it takes a lot of Magnesium to raise a Mg reading in a tank, so don't be shocked.
I just top up my SW, I know how to much to add to make my ingoing water 1500Mg and that seems to combat the Mg drain just fine. I was using Mag sulfate and Mag chloride from Eli and use the same dosing instructions as per BRS..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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