> I suspect so too and again, their thinking is obviously incorrect. That crap usually sits in the bottom of the water heater but it can become less safe with

> I suspect so too and again, their thinking is obviously incorrect. That crap usually sits in the bottom of the water heater but it can become less safe with time (e.g. forming lead salts or dissolving lead, as mentioned, or grow legionella cultures). It can also get stirred up and you can get a whole bunch more of it all at once. It also doesn't all come from the input supply; a lot of it comes from the hot water heater itself corroding over time.