Alessio,
The FeCl will damage your metal pipes and ducts in your home but I also believe that the copper that is etched shouldn't go down the drain.
In my opinion, FeCl may not be considered hazardous waste but it should be disposed of properly. In the area that I live, I was asked to take any FeCl I used to the local hazardous waste facility.
Frank P.
--- In Homebrew_PCBs@yahoogroups.com, Alessio Sangalli <alesan@...> wrote:
>
> On 06/04/2010 10:50 AM, Malcolm Parker-Lisberg wrote:
> > You can flush Ferric Chloride down the drain, it is already used by water treatment plants.
>
> I think he was referring to (metal?) pipes and ducts...
>
>
> bye
> as
>