Garnet Valley, PA - West Grove, PA
This large underground tank is directly connected to your home’s main sewage line. When you flush your toilet or run your sink, the waste water flows into the tank where it is digested by anaerobic bacteria. The process separates the waste into three parts. Solid waste sinks to the bottom, and lighter particles form scum on the surface. As more sewage is flushed into the tank, the older water is pushed into drainpipes where it seeps harmlessly into the surrounding field.
In older well-based septic systems, there is a large masonry-lined well covered by a stone or concrete lid into which the waste water flows instead of a tank. Once in the well, the anaerobic bacteria begins feeding on the sewage. Solid waste sinks and scum forms along the surface. Unlike tanks, which have pipes leading to a drain field, the well walls have small openings through which the water seeps out into the surrounding ground. As the process is not as efficient as with septic tanks, cesspool wells are now no longer installed.