Gail Futoran wrote:

"Pawel" wrote in message
...
Can I use the pressure treated wood as sort of moulding on the edge of
the pond? Or will it poison fish if it comes in contact with water?

Google pressure treated wood and read up on
what the wood is treated with. In the USA,
the old wood was treated with arsenic (or a
type thereof). I don't know what the new
treated wood is treated with, but just because it
is (presumably) safe for plants and humans
doesn't make it necessarily safe for fish.

Pressure treated wood is, in fact, highly toxic to humans. Just read the
warnings about working with it. otoh, heavy metals are not very toxic to
fish.

otth, copper is toxic to the invertebrates.
--
derek