Georgia Septic Installer Practice Test

What is the main purpose of an outlet tee in a septic tank?

1. To allow air to escape

2. To prevent scum from entering the drain field

3. To provide additional storage

4. To monitor liquid levels

The correct answer is: To prevent scum from entering the drain field

The primary function of an outlet tee in a septic tank is to prevent scum from entering the drain field. This component is designed with a specific shape that extends below the water line to help ensure that only the clarified liquid, which has settled below the scum layer, is allowed to exit the tank. By doing this, the outlet tee effectively maintains the integrity of the drain field by ensuring that solid waste and scum do not clog the leach lines, which could cause system failure or reduce its efficiency. The importance of this function cannot be overstated, as it directly impacts the longevity and operational effectiveness of the entire septic system. Keeping scum out of the drain field helps to promote proper drainage and nutrient absorption in the soil, which is critical for an environmentally sound wastewater treatment process.