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Hanna Colorimeters
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10-10-2013, 05:45 PM
Reef Pilot
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Join Date: Nov 2010
Location: Langley BC
Posts: 1,883
Believe your Hanna. I used to test with other chemical kits and used to think my phosphate was zero. When I got the Hanna, it showed phosphates, and took a while longer with GFO before it read zero, too.
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