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I have additional information ...
I purchased SALIFERT Phosphate test kit to verify the Hanna results. I know SALIFERT is not that accurate in low values, but I see very little color change - indicating 0-0.03 ppm.
That really does not make sense. Hanna checker HI 736 indicates above the limit of the checker. That would be, after conversion, above 0.6132 ppm.
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