Scum: Substances like oil and grease (which may come from the kitchen sink) that rise to the top of the wastewater in the septic tank. Effluent filter: A component, required in some locations ...

Septic tank waste disposal systems have a delicate equilibrium that helps to break down solid waste, while releasing effluent ...

Septic tanks are a lot easier to understand ... This liquid is called effluent. This secondary pipe has another filter on its entrance to keep most of the solid waste from coming through.