it has nothing to do with industry. it has to do with dissolved CO2 which makes it a
weak acid which will continue to leach the copper. the only metal that forms a
patina that stops further oxidation (commonly in use) is aluminum.
tell you what, check that pet place, I think they or MOPS has a copper test. get
that and test your rain water. then you will really know one way or the other.
Ingrid

(John Chelen) wrote:

Thanks for the info. However, I think our rain here is pretty neutral
since we don't have too much industry either here or upwind, as far as
I know. My tests of the water have always shown Ph neutral, but of
course, that's after the water has run off the roof. I'm now thinking
about applying a mild acid to my roof to accelerate the formation of
the patina and reduce the leaching. Does that make sense?



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