human
What are the most common types of septic tanks and how do they work?
assistant
The most common types of septic tanks are gravity-fed systems, which rely on a slope to allow wastewater to flow from the house to the tank; pressurized systems, in which wastewater is forced into the tank by air pressure; and dry-flush systems, in which water is injected directly into the drain field. All three systems use bacteria in the tank to break down solids and other contaminants before they can reach the drain field, preventing them from clogging up the system.