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"Nothing is born or perishes, but things that already exist combine, then separate again" Anaxagoras of Clazomenes (500 BC)
https://recuperation-eau-pluie.ooreka.f ... s-attendre
Here, others analyze, with reference to a professor of a Belgian University:
Wikipedia gives this: https://fr.wikipedia.org/wiki/Eau_pluviale
Again, without going into the numbers, my point was just to say that rainwater is not pure water (in the sense of distilled or osmosis water).
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