Which type of distribution boxes can be installed on tamped sand or gravel?

The equal-flow type of distribution box is specifically designed to ensure balanced distribution of effluent across multiple drain lines, which is essential for maintaining the longevity and effectiveness of a septic system. When installed on tamped sand or gravel, this type of box allows for equal flow to each outlet, helping prevent overloading any single drain line, which can lead to clogs or system failure.

Tamped sand or gravel provides a stable base, ensuring the distribution box remains level and functionally efficient. The equal-flow design helps to evenly distribute the effluent to each drain line, allowing for optimal infiltration into the surrounding soil. This balanced distribution is crucial, particularly in varied soil conditions, as it helps to maximize the treatment of wastewater while protecting the entire system from uneven wear and tear.

Different types of distribution boxes may have specific installation requirements or functions that do not align with the conditions of being placed on tamped sand or gravel. Therefore, the equal-flow type is the most appropriate choice for this scenario.