Tees must extend into the liquid of the tank by a minimum of what percentage?

The requirement for tees in septic tanks to extend into the liquid by a minimum of 25% is essential for ensuring proper flow and distribution of wastewater. When tees extend adequately into the liquid, they help maintain the necessary hydraulic conditions within the tank. This extension helps to reduce the potential for scum accumulation and allows for better mixing of the wastewater within the tank.

In septic systems, the liquid level needs to be high enough to allow for the proper function of the inlet and outlet points, which is crucial for preventing system failure. The 25% requirement is a standard that balances effective wastewater treatment while minimizing problems associated with floating solids and scum, ensuring that the effluent does not carry large particles out of the tank prematurely.

This percentage is a commonly accepted practice to enhance the efficiency of septic tank operations and promote longevity in system performance, thereby making it a critical industry standard.