How an AOSS (Alternative Onsite Sewage System) Works
An Alternative Onsite Sewage System (AOSS) is an advanced septic system designed to treat wastewater more thoroughly than a conventional septic system before it is released into the soil. These systems are commonly required in areas with poor soil conditions, high water tables, limited space, or environmental restrictions.
Unlike standard septic systems that rely mostly on gravity and natural soil filtration, AOSS systems use mechanical, electrical, and biological treatment processes to reduce pollutants and protect groundwater.
Step-by-Step: How Your AOSS Treats Wastewater
1. Wastewater Leaves the Home
All wastewater from sinks, toilets, showers, and appliances flows into the septic system through the main sewer line.
2. Primary Treatment (Septic Tank)
In the tank, heavy solids settle to the bottom as sludge, while grease and fats float to the top as scum. This begins the separation and treatment process.
3. Advanced Treatment Unit (ATU)
The wastewater then enters the treatment unit, where air, bacteria, and media work together to break down and clean the wastewater far beyond what a traditional system can do.
4. Disinfection (If Required)
Some AOSS systems include UV light or chlorination to disinfect the treated water before it leaves the system.
5. Final Dispersal to the Drain Field
The treated wastewater is then pumped to the dispersal field, where it safely filters into the soil.
