What type of tees must be equipped with an effluent filter?

An outlet tee must be equipped with an effluent filter because it serves the critical function of preventing solids and other large particulates from entering the drainfield or its components. The effluent filter captures solids that may still be present in the wastewater as it exits the septic tank, thus ensuring that only properly treated effluent flows into the drainfield. This is vital for maintaining the integrity of the drainfield, preventing clogs, and promoting proper drainage and treatment processes.

Effluent filters are considered an essential part of the outlet tee setup because they enhance the system's overall effectiveness and longevity. Proper filtering contributes to reduced maintenance needs and protects the environment by minimizing the risk of wastewater surfacing in undesirable locations.

In contrast, while inlet tees, access tees, and distribution tees play significant roles in the operation of septic systems, they do not require effluent filters in the same manner as outlet tees. Inlet tees help direct wastewater into the septic tank, access tees provide access for maintenance, and distribution tees are used for directing effluent into multiple drainfield lines, but do not require filtration as the outlet does.