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

https://aged-wiki.win/index.php/Septic_Tank_Pumping_and_Setup:_Economical_Solutions_You_Can_Trust

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