What we found after clearing the debris
The line was jetted to remove the material causing the immediate restriction. After that debris was cleared, water still remained in the pipe. Inspection showed a flat section holding water and a joint that had dropped where a plastic pipe met a clay drain.
The example is shared without a customer name or property address. The important detail is the sequence: clearing the material restored access to the line, then the remaining water and the joint condition pointed to a separate structural fault.
Why more jetting would not correct the joint
Jetting can remove grease, silt and loose debris from suitable pipework. It cannot raise a flat section, realign a dropped joint or rebuild a poor connection. If the pipe continues to hold water after cleaning, more jetting may remove additional deposits without fixing the reason they collect there.
The recommended next step
For this job, the recorded recommendation was excavation to expose and repair the defective connection. The repair location and extent should be based on the inspection findings and site conditions. No excavation or repair outcome is claimed here; the case shows why the cause needs diagnosing before further work is chosen.
What to do if your drain stays full after clearance
Tell the drainage engineer what was cleared and whether water remains in the line. A CCTV inspection, where access and pipe condition allow, can help locate a dropped joint, poor connection or section holding water. The findings can then inform whether further cleaning, monitoring or a targeted repair is appropriate.