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Strawman. Parent was talking about [(Cl^(-1))]

If you care about excrement content, that should be another study.

Bottom line: Representative sample https://en.m.wikipedia.org/wiki/Sampling_(statistics)

I think the point was that you need to ensure a representative sample and that requires an idea of the scale of the fraud taking place to be able to measure its impacts. I have no idea if that's possible without insider data or not, but I suspect that was the point of the argument, and not which substance was being tested for in the imaginary body of water being used as an example.

Yes, I am-- very-- well aware of what a representative sample means, and made my comment specifically with that knowledge in mind when I responded.

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