When using a partition in a dosing tank, what must the partition have?

The correct answer highlights the requirement for partitions in dosing tanks, which must include specific openings to function properly. The presence of two four-inch diameter holes allows for the equal distribution of effluent across the dosing system. This design ensures that when the tank is filled, the liquid can flow freely from one side of the partition to the other, facilitating uniform dosing into the drain field or filtration area.

This is crucial because if the partition did not have openings, it could lead to uneven flow, potentially causing one section of the drain field to become overloaded while leaving another section underutilized, which can result in system failure or environmental contamination. Therefore, the design encourages an effective and balanced system operation, crucial for the longevity and efficiency of commercial septic systems.