Abstract: An aerobic system provided to treat sewage generated by a modern larger home which does not have access to a municipal sewage connection The features of this system are adaptable to upgrade and/or replace existing systems. In a preferred embodiment the system uses two 1000 gallon tanks, a first pretreatment tank to receive raw sewage, remove settleable and floatable solids from the sewage, and discharge into a second tank in which the pool of sewage is aerated. The second tank contains a motor driven aerator and a unique self-cleaning filter driven by an outgoing liquid stream from the aerator. After passing through the filter, the liquid is then discharged into a leaching field or nearby stream as permitted by the proper regulatory agency.