question put to Google like:
"toxicity problems with rainwater collected off metal roofing"
Tried that phrase and got:
Information on Zinc Oxide in Construction - Zinc Metal Roofing Systems
The run-off water can contain zinc ions. Since zinc is an element
essential for life and most organisms ... For instance, rainwater
collected from VM ZINC roofs, can be used without any known problems for
watering plants. ... Actually there are many types of heavy metals some
that are toxic and some that are not. ...
www.metal-roofing-zinc.com/zinc_roofing_basics.htm - Cached - Similar
and:
http://www.homesteadingtoday.com/archive/index.php/t-376478.html
Key reply:
"I wouldn't drink rainwater off a roof unless it had been sterilized by
some means, boiling or chlorine or such. Bird poop can carry some nasty
parasites and pathogens. You can do it, and get away with it, but it is
a gamble."
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