The jetters are self propelled using water pressure pushing against the pipe to go in. When the jetter hits the clog it will slow down or stop until it clears the obstruction. Then when the jetter starts going in again it has cleared the stoppage. I usually keep running the jetter in for a few more feet to mke sure that was the only problem then pull it back slowly running it back and forth until it comes out. The best way to run a jetter is from below the stoppage in but in most cases this is not possible unless you dig down and install a cleanout going into the structure. You can go to the gen-eye web site and watch a demo of how it works. They use to have a demo anyway.Al,
I was thinking if he used 30' he probably went through the clog. How do you know when you are in the problem area with a jetter. Does it push through a clog like a snake. I was out of the business before they came out with all those cool jetters and cameras and stuff.