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

https://oscar-wiki.win/index.php/Trustworthy_Septic_System_Emptying:_What_to_Anticipate_From_Expert_Crews

For hydro-jetting, isolate the line, install a backflow preventer, start with lower PSI, then increase as required, utilizing appropriate nozzles to search biofilm, roots, and scale without harming pipelines.