Pond edging

We are edging our new pond. OH bought some wood treated with weather proofing chemical. For the techies amongst you, Fenoxcarb and Didecylpolyoxethyl-ammoniumborate. I'm concerned these may leach into the water. I think we should use an untreated hardwood. What do you think?
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Don't know, it's a pretty long word though, mine's edge with grass and weeds?