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

https://wiki-dale.win/index.php/Budget-Friendly_Septic_System_Cleaning:_Professional_Tips_and_Resident_Services

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