How do septic tanks work?

“A septic system that was properly designed and installed needs only occasional ‘pumping’ to remove the sludge and scum from the tank. But without knowing how does a septic tank work, you can do things that harm or destroy the system.”

Septic tanks are designed to collect sewage and wastewater from households that are not connected to the mains sewer.  There are two main types of septic tank applications:

Septic tank with a soakaway

These can be constructed from a variety of materials including brick or concrete. More modern systems are often made from fibre glass or polyethylene.

Read more: https://www.csg.co.uk/household-sewage-services/information/how-do-septic-tanks-work