News of a water storage tank that is bactericidal - e.g. to E.Coli
within 48 hours: brass!
British researchers joined with Punjab U researchers to check the
supposition that the Indian tradition of carrying water in mutkas
(brass pots) was beneficial - which confirmed the suspicion, given a
dwell time of 48 hours plus.

The action stems from a low copper leaching rate out of the container.
The copper level in the water is extremely low and safe - in fact,
only a fraction of the recommended intake.

[New Scientist, 9 April 2005, p.14]

Brian Whatcott Altus OK