What do the terms "block outs" refer to in the context of a septic tank?

The term "block outs" in the context of a septic tank refers to openings in the septic tank. These openings are intentionally designed spaces that serve specific functions, such as providing access for maintenance or connections for plumbing lines. Typically, block outs are found in areas where future connections may need to be made, or where additional features, such as risers for access, are planned.

Having these openings allows for efficient drainage and venting, which are crucial for the effective functioning of a septic system. This design consideration helps prevent issues like pressure build-up inside the tank, which could compromise the integrity of the septic system or lead to system failures. Understanding the role of block outs helps in both the installation and maintenance of septic systems, ensuring they operate smoothly and are accessible for necessary inspections and repairs.