Yes the water heats up when mixing salt, my container is not food grade plastic container maybe there is something there, no way for me to find out but I do have 55 gal. food grade barrel, I may have to consider using that instead. Yeah you’re right hannah have +/- 0.04 margin of error, plus 0.03 phosphate is fine with me as long as I dont see any issues with the tank, i will be closely watching it though.
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