All septic systems rely on bacteria to gobble up the solids and pathogens. It works an awful lot like your body's digestive system. You have great germs and bad germs in your body. When the bad bacteria wins, whether it's since your body is off balance or you've needed to take prescription antibiotics and the bad stuff restores first, you wind up with stomach pains and other problems. In your wastewater treatment system, there is also bad and excellent germs. The great stuff has to remain in the system to break down the waste and feast on anything that's unsafe, however it's already there. It is available in with your waste and goes to town dining due to the fact that you're always including food to your system for it.
Bacteria in the Reservoir.
As you fill the reservoir with wastewater, it splits into three layers. The waste and thick products sink and form a layer of sludge. The buoyant materials, like grease, form a layer that drifts, called residue. The effluent, or liquid, sits in the middle.
The bacteria will lower your sludge layer all by itself. It can convert as much as 50% of it into gas or liquid. The rest of the solids have to be drained on a regular basis. When the center layer of effluent rises in a traditional system, it can move onto a second chamber, which works like the very first, or it might move directly onto a leach field.