On Mar 4, 2008, at 4:12 AM, Carl Denk wrote:

> And I'm not saying anyone has done it, but it is a definite NO-NO.
> For municipal systems, it can destroy pipes, but worst upset the
> chemical process of the sewage treatment plant, or elements that they
> are not set up to handle are passed through into the environment.

Not in hobbyist quantities.  Really.

(One of the industrial usages of ferric chloride is ... sewage  
treatment.
And the copper content is dwarfed by, for example, the people who dump
a couple pounds per year of copper sulfate down their drains to keep
roots from invading their drainpipes.)

BillW

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