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

https://research-wiki.win/index.php/Trustworthy_Septic_Tank_Emptying_and_Installation:_Smart,_Cost-Saving_Methods

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