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

https://yenkee-wiki.win/index.php/How_Routine_Septic_System_Cleaning_Conserves_Cash:_Dependable,_Professional_Suggestions

For hydro-jetting, isolate the line, install a backflow preventer, begin with lower PSI, then increase as needed, using appropriate nozzles to scour biofilm, roots, and scale without damaging pipelines.