What does a high velocity cleaner primarily achieve in sewer maintenance?

A high velocity cleaner is specifically designed to use high-pressure water jets to clear sewer lines effectively. Its primary function is to create a strong flow of water that can push debris, sediment, and other obstructions away from the pipe walls and towards the downstream areas, making the pipe system more efficient and reducing the risk of blockages.

When utilizing high velocity cleaning techniques, the force from the water jets can dislodge materials stuck in the sewer line, which is crucial for maintaining optimal flow capacity and preventing back-up issues. The effectiveness of this method is particularly evident in cleaning critical areas that may experience frequent blockages due to accumulated waste.

While removing blockages and improving drainage are outcomes of using a high velocity cleaner, the standout element of option C is how it explicitly describes the action of pushing water clear of obstructions, emphasizing the mechanics of operation.

It's important to note that strengthening pipe walls is not a function of high velocity cleaning; rather, that concerns pipe maintenance and inspection practices.