Which method is commonly used in jetting during sewer maintenance operations?

In sewer maintenance operations, jetting is primarily carried out using water under high pressure. This method is effective because the high-pressure water stream is capable of dislodging blockages, debris, and buildup within sewer pipes. The force generated by the high-pressure water not only clears obstructions but also helps to clean the pipe walls, improving the overall flow and functioning of the sewer system.

Using water at high pressure is advantageous because it can reach difficult areas without the need for physical contact or invasive techniques, which could potentially cause damage to the infrastructure. This approach is widely accepted in the industry for maintaining and restoring the optimal performance of sewer lines.

Other methods such as mechanical scrubbing or hydraulic suction may have their place in specific circumstances, but they do not provide the same level of effectiveness in clearing blockages as high-pressure water jetting does. The combination of air and water, while useful in some maintenance techniques, does not directly describe the primary jetting method employed for sewer maintenance.