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If you only find out later, is it any use at all?

I found out my drinking water had low levels of lead, for about ten years.

Not a doctor, but my understanding is that low levels of lead are most impactful on children. Using chelation on adults with low levels of lead may create more problems than it solves.

How did you find out. What test?

The city sent by an engineer in training with a lead meter. Not sure of the nature of the test but there are standard ones for lead.

Is there a similar treatment for mercury?

DMPS (2,3 Dimercapto-1-Propanesulfonate)

Does that reverse the brain damage?

No, obviously not it just strips lead out of you bloodstream and cells.