How do I decide between a “Power Drain Snake” and a drain cleaning jet kit?
If there is a blockage (which it sounds like there is since it's backing up) then you probably want to snake it before jetting since jetting alone is not going to remove a big blockage.  How big is the drain? If it's large (like a 4" sewer line) then a power drill snake is probably not going to cut it and you need a drain auger with a larger diameter and some attachment options.  Something like this: .