Boron has been recognised for its anti-fungal qualities for many, many years. In fact Boron is found in medicinal treatments for conditions such as athletes foot, vaginal thrush and is even used in eyewashes.
Because of these anti-fungal qualities timber treated with Boron will last significantly longer than untreated wood, increasing the lifetime service of the wood. And at the end of the woods useful life there are no disposal issues because the treatment is so natural. There are no issues arising from chemicals leaching into the water table etc, so provides the ideal solution for timber preservation.