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What is the required distance from the top of the precast pump/dosing tank to the invert of the inlet opening?

  1. 6 inches

  2. 12 inches

  3. 18 inches

  4. 24 inches

The correct answer is: 12 inches

The required distance from the top of the precast pump or dosing tank to the invert of the inlet opening is set at 12 inches. This specification is crucial for ensuring proper operation of the system, particularly for allowing adequate flow and preventing potential backflow or overflow issues. Having this distance maintained helps to prevent the inlet from becoming obstructed, ensuring that the tank can fill to the appropriate level for optimal functioning of the pumping mechanism. Additionally, the 12-inch distance assists in maintaining proper levels within the tank to aid in effective dosing of effluent into the drain field or other treatment areas. Proper adherence to this guideline is important for both the efficiency and longevity of the septic system installation.