My Aquifer > Septic System Basics > How do they work?
Waste is broken down by the chemical/biological action of bacteria.
Solids that can't be digested are retained in the tank and are called "sludge".
Liquid effluent is discharged into the soil for further cleaning and reintroduction to the environment through a network of pipes called a tile bed.
The oxygen in the soil helps the aerobic bacteria in the soil further purify the effluent.
Most modern septic tanks have at least two chambers, and some have three. This helps to create slow flow of the liquid, allowing solids to settle to the bottom or float to the top, thus preventing them from entering the tile bed.
TAKE A LOOK at a septic system diagram.