First off hi to all and thanks to anybody who may help. Built a house and moved in in february. Since then there has been a distinct smell of sewage at the side of our house. The system is located in the backgarden but obviously when the wind blows it carries the smell. The contractor has stated the problem is due to the water being treated in the area and this kills off all the natural bacteria but surely if this was the case all systems would be affected the sameway? Thanks for any advice that you can give.