"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?

pawel

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.

Also remember that even if the wood is
above the pond water level, rain will wash
any contaminants into the water.

Gail
near San Antonio TX