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Thank you for your response!

"0" should never be on a test report. "< the detection limit" should be used. For most low-level hardness tests, that would be "<0.5 ppm." For iron it might be "<0.010 ppm." The detection limits should be on the test instructions. ------------------------------ ...

I'd like to know that too for different systems, so we don't have to report zero which doesn't mean anything in industrial systems. We never report zero in environmental studies. We always report less than a specific number which can be measured. ...