kenneth scharf wrote:

If lead is insoluble in water, then WHY isn't it used in plumbing?

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Lead is NEARLY insoluble in water, but the more acid the water is, the more
soluble it becomes.

And to answer your question, it WAS used in plumbing for many years until
someone made the connection. Just like carbon tetrachloride for dry cleaning or
asbestos for insulation.

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Bill W6WRT