JanRwl@... wrote:
> In a message dated 10/6/2008 7:47:55 P.M. Central Daylight Time,
> steve@... writes:
>
> I've been stockpiling my waste etchant for too long, some time soon I
> need to get rid of it safely...<<
> Flush it down the loo, and don't TELL anyone! If any fears or feelings of
> tree-huggingness, do so only a liter per evening, or whatever!
FeCl is used as a floculent in sewage treatment. CuSO4 is in toilet sewage
pipe un-blocker tablets (root-rot). Used etchant is a very good weedkiller
and root killer for blocked pipes.
Because i'm using a bubble etcher, i just top up the etchant with HCl and
am using the same etchant for 2 years. It never gets 'spent'.