On 10/21/2014 11:16 AM, Tony Moody wrote:
Almost anything will do the purple number I think. A
trace of soap or detergent? But one time I got a clear
red brick colour using water off a galvanised roof while
travelling. Never seen that again.
(snip)
Galvanized roofing definitely sheds both dissolved zinc and
zinc oxide powder into the runoff. I worked at a factory,
where they had to evaluate all their runoff to see if it was
good enough to pass directly to the river. Every building
with galvanized roofing had to have its water collected and
treated, before it met the state requirements for water to
go to the river.
--
Regards,
John Popelish
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