What must the supporting surface for a membrane liner be?

The supporting surface for a membrane liner must be stable and structurally sound to ensure that it can properly support the liner and maintain its integrity over time. A stable surface prevents the liner from undergoing excessive stress or deformation, which could lead to punctures or leaks. Additionally, a structurally sound base is vital to avoid any shifts or movements that could compromise the overall system. This is particularly important in septic systems, where the membrane needs to provide effective containment and separation of materials to function correctly.

In contrast, uneven and compacted surfaces can create pressure points that could damage the liner, while flexibility or adjustability could lead to instability. A rocky and soft supporting surface would also fail to provide the necessary support, potentially leading to failures in the system as well. Thus, a stable and structurally sound surface is critical for the successful installation and operation of a membrane liner in septic systems.