On 29 May 2006 01:54:56 -0700, "Leon"
wrote:


Dave Platt wrote:
In article .com,
Leon wrote:

I just flush it down the toilet. I think that ferric chloride is used
for water treatment and I can't see the small amount of copper doing
any harm by the time it has been diluted millions of times. It's only a
litre ot so every six months - it's negligible.

By the time you dump it in this way, you aren't dumping pure ferric
chloride by any means! You're dumping a residual amount of ferric
chloride, plus a bunch of copper chloride.

Small quantities are acceptable, here in the UK.

Leon

A book I read a long time back recommended mixing spent solution with
concrete powder and sending the resulting brick to the dump. Seems like
one of the best ideas I have heard of if you really care about possible
impacts.