SEWAGE DEPARTMENT TRAINING PROGRAM
How an Elevated Sandmound Works
The effluent flows through the aggregate and into a pile of sand. A bio-mat also forms on the surface of the sand aiding in renovation.
The sand also does three other things ...
#1 The sand holds back suspended soils that may have escaped the septic tank(s). The bio-mat on the sand consumes these solids.
Sand prior to adding aggregate.
