Hmm..comments are interesting. The DkH of sea water is 7.5. Because I run Ultralith I have to keep it around that mark. I have tried raisng my DkH even 1 point I found I was tossing in a lot of Carbonate. I find it hard to even consider a Dkh of 9 as trying to raise it that high would probably throw my other prams out of wack. For those who have consistently high DkH I wonder if it isn't the salt that is doing it or not using RO/Dionized water for make up.
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