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 I found the article I was looking for which discusses salinity and how to measure it by Randy Holmes Farley... http://reefkeeping.com/issues/2004-06/rhf/index.php  .  I only include it because your salinity seems so low that I question if it is an accurate reading.  The begining discusses salinity and the end the different ways to measure it.
				__________________"Government is the great fiction, through which everybody endeavors to live at the expense of everybody else." -- Frederick Bastiat
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