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Unread 05/31/2007, 05:20 AM   #6
brianbigoats
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Join Date: Jun 2005
Location: Lodi, CA
Posts: 1,122
with my Hanna Colorimeter i run 0.03-0.00
Any Test PO4 test kit most likely wil read 0 when you are below .1 so 0 is not acually zero the best way to test is w/ Colorimeter


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