Treating Wood for exterior use

Hi, I'm doing some building over the summer: pergola's, platforms & outhouses. I've learned a lot from the forum (especially JC White Cloud's posts), but I wanted to see what thoughts were regarding wood treatments for exteriors. I have plenty of pine trees , and about 10 times that in Oak.

I normally soak wood that is going to be on the ground or any place that termites can get to with Borax. The hard part of soaking is to have a container that will hold the borax solution and also fit the boards.

You can also paint this solution on but I don't think it will work nearly as well as the 30 minute soak I prefer.

Borax will stop termites, black mold, mildew, most mushroom spores. It is not harmful which is the biggest plus.