I've got an old (1968) house w/ cast iron sewer pipes that drain really slow and are very clog-prone.

I'm getting a ton of junk mail flyers from plumbing companies offering the "in-place" cleanout and relining of pipes without having to dig trenches in the yard or inside the house.

Does anyone have experience with or price info regarding these?

To simply "jet out" the pipes in this 3Bed/2bath house on 0.25 acre lot, I have an estimate of around $2K, with a warning that it might actually damage some of the pipes in the process.

For pipe "relining" I've seen internet discussions citing the $6K to $20K range.

Is it reliable or a rip-off?

TIA

Curtis