This episode of Build Show with Steve Baczek focuses on septic systems, including septic tanks, distribution boxes, and septic fields. The video provides a basic overview of how septic systems work, including the process of waste flowing from the house to the septic tank, then to the distribution box, and finally into the septic field where the water percolates back into the ground. The importance of proper placement of the septic system on the property is also highlighted, as well as the role of septic engineers in designing and testing septic systems. Overall, the video offers valuable insights into the workings of septic systems in construction projects.