7.0 dKH is natural seawater.
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[FONT=Georgia, Times New Roman, Times, serif][SIZE=-1]http://www.reefkeeping.com/issues/2004-05/rhf/index.php[/SIZE][/FONT]
Check that link out ... everything should be covered right in there.
That's a great link! I wish we could get somebody to do a write up like this in their own words for CZ! :D