Which hydraulic cleaning technique involves using a long rod with a ball attached?

The technique that involves using a long rod with a ball attached is known as balling. This method is used primarily for cleaning sewer lines and involves inserting a flexible rod with a spherical attachment into the pipe. As the rod is pushed through the line, the ball helps to dislodge and remove debris and obstructions. This technique is particularly effective for clearing stubborn blockages in sewer systems or drainage pipes that may be caused by grease, roots, or other materials.

The design of the ball allows it to navigate bends and turns in the piping system while providing enough resistance to break apart and push through any built-up material. This method is distinct in its application when compared to other cleaning techniques, as it specifically utilizes the ball's shape to facilitate the cleaning process effectively.