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[banditpowdercoat]

Well, I heated the water till just started to see a couple boil/ let cool, about 4 hrs. The reading is off the chart. I would guess 6-7 judging by the shade increase from the last one on the test sheet.

Now, if heating it gives true PO4, why doesn't the directions call to heat it? I mean, if the kit is not accurate as described? Thought Salfert was one of the good brands.