The distribution box requires a baffle
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It consists of a baffle to prevent scum from entering outlet pipes, an effluent filter to trap solids, inlet and outlet pipes, weeping holes for excess water drainage, an inspection port for monitoring, and a riser for easy access. The distribution box, often called a D-box, serves as the traffic controller for your septic system. Evenly distributes septic tank effluent into a leaching system, typically a septic field. When it fails, symptoms include uneven wet spots in the yard, slow indoor drains, and sewage odors. In a septic tank, the baffle serves as a barrier that directs the flow of wastewater, allowing solids to settle at the bottom while the liquid effluent rises to the top.