Protecting wood bridge
Up to 2003, that was the case. Arsenic was used and was verry
effective. Now a copper base is used instead. It too is toxic. Good
not to put it in a small pond. In a big pond, the timbers of the dock
will be pressure treated.
Pressure treated wood will weather and should be sealed in some
manner. The amount of leaching from structures around a pond is
probably very small.
Jim
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