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Plenipotentiary-at-large
But is it the whole truth?
I'd bet there are many substances that will make PF change to red/orange, and believe heavy metal concentrations would have to be almost impossibly high/off the chart to cause immediate symptoms/death. DC flushes their system with chlorine every spring, no idea about other areas.
The Polyfilter does not lie...
My money's on your municipal water treatment plant dumping a little something extra in the water.
Matt
I'd bet there are many substances that will make PF change to red/orange, and believe heavy metal concentrations would have to be almost impossibly high/off the chart to cause immediate symptoms/death. DC flushes their system with chlorine every spring, no idea about other areas.