Sewer/Septic Line Issues: Snake Them or Jet Them?

[John Thedford]

We have had some issues with a lot of grease in the septic lines. Some of it is fresh (yellowish color) and some older grease (white in color). We have had the tank pumped 3 times in 4 months and I suspect there is more grease throughout the lines. Talked to a plumber and he wants to snake out the lines. Someone else suggested "jetting" which is a process using water to clear the lines. Anyone have any knowledge or experience as to what process may be the most effective to most thoroughly clear/clean them?