Here in the US, homes built in the last 40 years or so almost always
use plastic (PVC or CPVC) drain pipes. Older ones sometimes use
copper, sometimes use iron.

I don't think the erosion of the pipes is an issue if A) you heavily
dilute the FeCl when you dispose of it and run a few gallons of extra
water down the drain after the FeCl and B) do not do this very often.

Sean


On Sun, Dec 20, 2009 at 11:27 PM, PICdude <picdude3@narwani.org> wrote:
> Are the drains copper? =A0Or just the supply lines?
>
>
>
> Quoting Mark Perri <mjperri@gmail.com>:
>
>> If you pour it down your pipes aren't you going to oxidize all your copp=
er
>> pipes and dissolve them?
>>
>> On Sun, Dec 20, 2009 at 7:04 AM, Dario Greggio <adpm.to@inwind.it> wrote:
>>
>>> Spehro Pefhany ha scritto:
>>>
>>> > THE major use of FeCl is for water treatment (as a flocculant), so I
>>> don't
>>> > think it's so bad (legality/illegality aside for the purposes of a
>>> > theoretical discussion). But the Cu contamination
>>> > can harm the useful microbes in a septic tank, which would not be nic=
e.
>>>
>>> [...]
>>>
>>> thank you Spehro.
>>> Indeed, it was causing big stains :)
>>>
>>>
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>>>
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