To gain a better understanding of how the Green PostTM system works, it is important to understand the mechanisms of decay.
Sections of a post decay at differing rates...
First Section - The area 2'' above the soil-line to the top of the post is exposed to sunlight and good air circulation. This is a preferred environment for wood posts to last a long time.
Second Section - The area 2'' above the ground to 6'' through 16'' below the soil-line is the most vulnerable area for post decay to occur because high moisture content combined with available oxygen and soil nutrients is most favorable for biological growth.
Third Section - Required levels of oxygen is not present for biological growth in the area 16'' below the ground-line to the base of the post. Even though moisture availability is typically high at this depth, there is not enough food and oxygen to support the presence of wood destroying organisms.