Gardens Copper pipe
copper pipe OK to use for a water feature that is going in my fish
is toxic to fish at quite low concentrations and has been responsible
for a considerable number of fish deaths. Having said that, it is
only really new or recently polished copper that usually causes
a problem. Once it has become tarnished, most copper pipe should
be safe for fish. If in any doubt, coat the copper with a clear
sealant to be on the safe side.
Gardener, Issue 91, 2002, Page 20
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.