Which of the following methods can be used to clean sewer lines?

High velocity cleaning is an effective method for cleaning sewer lines and is widely used in the maintenance of sewer systems. This technique involves using water at high pressure, typically through specialized vacuum trucks or jetting equipment. The high-pressure water jet dislodges debris, sediment, and buildup within the pipeline, allowing the materials to flow freely and improving overall sewer line performance.

This method is particularly advantageous because it can reach areas that may be difficult to access for other cleaning techniques. Additionally, high velocity cleaning is efficient and can complete jobs quickly, minimizing disruption to the surrounding environment. It is essential for maintaining proper flow rates and preventing blockages, ultimately contributing to the reliability and longevity of the sewer system.

In contrast, the other methods mentioned do not primarily focus on physically cleaning the interior of sewer lines in a manner that is directly comparable to high velocity cleaning. Grouting is typically used for sealing joints and repairing leaks rather than cleaning. Biological treatment uses microorganisms to break down organic materials, which may not effectively remove the physical debris present in sewer lines. Chlorine injection is primarily employed for disinfection purposes rather than cleaning.