What is the recommended depth for DI tubing installation?

The recommended depth for drainage infiltration (DI) tubing installation is typically 6"-12" below the naturally graded surface. This depth is specified to ensure proper functioning of the system while also allowing for effective filtration and drainage of water. It provides adequate space for the tubing to adequately handle the entering fluids without being too shallow, which could lead to issues with surface runoff or superficial water accumulation.

Installing DI tubing at this depth ensures that it is properly situated within the soil profile, where it can efficiently filter out solids and introduce treated water back into the soil. This depth also helps to minimize potential disturbances from surface activities or weather changes, enhancing the longevity and effectiveness of the system.

The other depth options are less optimal because they either place the tubing too shallow, risking interference from surface conditions, or too deep, making access for maintenance and function less effective. Thus, the choice of 6"-12" is not only practical but also aligned with best practices in septic system installation.