Everything that goes down any of the drains in the house (toilets, showers, sinks, laundry machines) travels first to the septic tank. The septic tank is a large-volume, watertight tank which provides initial treatment of the household wastewater by intercepting solids and settle able organic matter before disposal of the wastewater (effluent) to the drain field.

Function of the Septic Tank
How Long Liquids Must Remain In Tank
Solids Storage
Anaerobic Decomposition
Flow Into And Out Of The Tank
Effluent Filter
Flow Buffering
Microbes in Septic Tanks