For hydro-jetting, isolate the line, install a backflow preventer, start with lower PSI, then increase as needed
http://www.video-bookmark.com/user/magdannbhp
For hydro-jetting, isolate the line, install a backflow preventer, start with lower PSI, then increase as required, using appropriate nozzles to scour biofilm, roots, and scale without damaging pipelines.