[DIYbio] Non-toxic treatment to elevated planter

Hi,

I'm mounting, at home, an elevated planter, similar to this:
http://www.livinggreenplanters.com/wp-content/uploads/2011/03/110124osm_livinggreenplanter_006.jpg
https://img0.etsystatic.com/000/0/6187795/il_570xN.211267472.jpg
https://img1.etsystatic.com/000/0/6187795/il_570xN.211267537.jpg
https://img1.etsystatic.com/000/0/6187795/il_570xN.211267575.jpg
https://img0.etsystatic.com/000/0/6187795/il_570xN.211267642.jpg

To develop some automated ferti-irrigation systems with Arduino and also
to grow some vegetables for food.

Now I'm in doubt about the best treatment, what type of product I could
apply inside the planter, which will be in contact with soil and
moisture, to protect (preserve) the wood of fungal attack but not
contaminate vegetables I'll grow (and eat) and avoid toxic effects to
plants and earthworms.

Aty tip?

Thanks,
Markos

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