Question

This question is based on the "Roman Bath" video. What coated the inside of Roman lead water pipes and is generally credited with preventing lead poisoning?

Answer 1

Answer:

What coated the insides of Roman water pipes was mineral deposits.

Explanation:

Back in ancient Rome the water was rich in minerals, that would create a crust inside the aqueducts by deposition, coating the pipes and protecting the water from lead contamination.

Over time, the build-up of mineral deposits can clog the pipes, which requires periodic maintenance, in many cases the coating of the pipes could be  accidentally removed.