The wall pillars are ready. The next step is to insert bamboo poles as intermediate elements, but they must be treated beforehand. Because bamboo is on the menu of some small crawling animals that love it for its sugar content. This can be remedied by treatment with boron salts, which are not really toxic, but make the bamboo inedible for the animals. In this way, bamboo can be preserved in an environmentally friendly way. We were finally able to procure the borax and boric acid components required for this (last picture). Now it is time to prepare for the treatment of the first bamboo culms … an important milestone!