For this and the next few months, we will discuss soil treatment units, beginning with the most conventional: flow by gravity into a series of underground trenches or beds.As we travel the country, we often see misconceptions about how these most basic systems work. So before we get into installation specifics, let’s spend a little time on an overview of the systems. We can then use that information as we move on to examine other more complicated systems.Piping and rockThe system we are talking about consists of a piping network to receive septic tank effluent with rock or some other
