Wastewater flows from the home to the septic tank through the sewer pipe. In this kind of system, solid waste enters your septic tank and settles at the bottom. Septic Tanks Inspection Testing Maintenance Septic Tank Systems Septic Tank Septic Tank Design What is a septic system? How does a septic system work for home . The septic tank is a watertight box, usually made of concrete or plastic, with an inlet and outlet pipe. This, over time, turns into sludge. A septic system is an efficient, simple method of disposing of household wastewater. Water first flows from a home’s sewage line into a septic tank, a large. How a septic tank system works. Depending on the type of aerobic system you own, you may need multiple units to ensure the water comes out clean. Typical septic systems contain a septic tank, where solids are removed from the wastewater, and a leach field, where partially treated wastewater is. When wastewater passes through the septic tanks, heavier soli...