The phrase "it swallows" in the context of large pipes refers to the pipe's ability to transport materials efficiently. A pipe that "swallows" well is one that can handle a high volume of material without clogging or experiencing other issues.

Repacking involves replacing worn-out or damaged parts, such as gaskets and seals, to prevent leaks and other issues. Rehabilitation, on the other hand, involves restoring the pipe's original condition through cleaning, lining, or other methods.

Over time, large pipes can deteriorate, and their performance may decline. Repacking and rehabilitation are essential to restore their original performance and extend their lifespan.