Originally posted by regexcellent
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On the second point, you're entirely incorrect. Lead from pipes *does* enter the water supply; this is something I know a lot about given I bought a house with likely lead piping from the mains (and perhaps lead mains). Typically the lead pipes get a layer of PbC03 coating them after 5-10 years which prevents lead from entering the water supply after *that*, but prior to that there is some in the water; and if you do anything to acidify the pipes you get lead sugar which dissolves happily into water (the romans poured wine in theirs, for example, trying to take advantage of this).
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