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

https://juliusbcvm879.cavandoragh.org/septic-system-pumping-as-well-as-upkeep-a-home-owner-s-step-by-step-resource

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