The mechanism of sand barrier is very similar to snow fence. So the sand barrier should also be set back some distance from the road, railway or building. The only difference is that snow will melt when the temperature goes up, but sand could not melt. After some time, the barrier might be buried by the sand, and the effectiveness will reduce. Such being the case, how to extent the life of sand barrier is very important. WalMax sand barrier has his own patent on this aspect.