Are you going out to the street sewer??
Measure the distance to the curb/street and go no further.
If tree roots are the problem, you can usually feel when the
auger has passed thru them.
You can also keep water flowing into the drain (if possible)
and stop when the water no longer backs up in the drain.
Some augers are limited to ~75 feet of cable, some ~100 feet;
really big ones can go even further.
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