> One caveat for the homebrew board etchers:
> Copper ions are death to septic system bacteria. You are
> asking for big, expensive, trouble if you are on a private
> septic system and you dump spent etch down the drain. It is
> also highly immoral, if not illegal, to dump it into a city
> sewer system. Putting it out in the trash is also rude....
>
> Dealing with the toxic waste is one of the more difficult
> problems with hobby-etching.

Yes but you can electro-plate the copper from the spent echant, changing it
back to FeCl, just use some nails for the electrodes. No need to throw any
away, just keep reusing it.

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