[...] etch the board in 5-10 minutes and flush in the toilet. Job done. Quick and clean.
The toilet? Really? You don't eat fish, do you
are you feeding some fish-farms with water from the sewers in Austria ? I would be more worried about the industrial waste water than a 50ml of etchant with 1gram of copper in it
i personally use the official waste collecting places to dispose all suspicious waste (we have those in every town), but i know very well what amount of industrial shit is disposed into the rivers. ecology is one thing... but corporate cost savings is another which always wins unfortunately
it's like that even in your ecological country (otherwise the Danube would be crystal clear when entering my country right ?)
don't get me wrong.. .i like the way your country is trying to be more green - big thumbs up for that
and even bigger thumbs up for the ecological consciousness of the citizens of Austria !
but let's not ignore the corporate and industrial reality
the industrial waste is killing the nature, not the minor waste which comes from a misbehavior of individuals.