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- Jan 11, 2019
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So I've added 2 TSP of copper power to my 20 gallon QT tank, which should be ~0.8 ppm. I did 4 tests on my hanna copper checker. First vial contained RODI water no salt. The first 2 tests were 0.2 ppm, next was 0.39 ppm, and last was 0.35 ppm. Anyone else have problems with hanna checkers? I thought they were the most accurate tester.
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