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

https://astro-wiki.win/index.php/Choosing_an_Expert_for_Septic_Tank_Pumping_and_Cleaning_on_a_Budget_plan

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