For hydro-jetting, separate the line, install a backflow preventer, begin with lower PSI, then increase as needed
https://wiki-stock.win/index.php/Reputable_Septic_Tank_Emptying:_What_to_Expect_from_Professional_Crews
For hydro-jetting, isolate the line, install a backflow preventer, begin with lower PSI, then increase as needed, utilizing proper nozzles to scour biofilm, roots, and scale without damaging pipelines.