For hydro-jetting, isolate the line, install a backflow preventer, start with lower PSI, then increase as needed

https://wiki-triod.win/index.php/Inexpensive_Septic_System_Pumping_Services:_Dependable_Look_After_Your_Home

For hydro-jetting, separate the line, install a backflow preventer, begin with lower PSI, then increase as required, using proper nozzles to search biofilm, roots, and scale without harming pipelines.