Dear Mary Rose, Good ...

Dear Mary Rose, Good question.

He home waste send to sand filter consists of layers of sand and gravel in which the wastewater is treated before it is distributed into the soil. Other types of filters use small foam pieces or peat as a filter medium. With suitable climate and soil conditions, other alternative systems such as evapotranspiration systems, constructed wetlands, spray irrigation, lagoons or mechanically aerated systems for household wastewater treatment are approved in some localities. However, they provide good wastewater treatment on home sites that are otherwise unsuitable for development because the soil type, depth or area is inadequate for an on-site treatment system. The effluent from an aerobic unit can be discharged into a soil absorption system. Holding tanks may be used in temporary situations, such as when you are awaiting a new system hook-up or are at a summer residence.