--- In
Homebrew_PCBs@yahoogroups.com, Malcolm Parker-Lisberg <mparkerlisberg@...> wrote:
>
> You can flush Ferric Chloride down the drain, it is already used by water treatment plants.
>
> Malcolm
>
> I don't suffer from insanity I enjoy it!
>
You sure don't want to do that if you have any metal pipes or fittings. Not to mention it's illegal (in the US anyway) and the dissolved copper is highly toxic to marine life.
Mix it with sodium hydroxide and you can pour off the saltwater that it makes and dump the precipitate in a sealed container to throw in the trash.