If a drain keeps clogging in the same spot every few months no matter how many times it's been snaked, that's usually a sign the pipe walls have buildup that a cable alone isn't clearing. The same goes for drains that are slow rather than fully blocked, since gradual buildup along the pipe is exactly what jetting is designed to remove.
Grease-heavy kitchen lines and older pipes with years of buildup are especially good candidates for jetting, since the high-pressure water scrubs the interior clean instead of just clearing a path through the middle.
