Pressure is only half the story
Jetters are often described by pressure, measured in pounds per square inch. Pressure gives the water its cutting force. Flow, measured in gallons per minute, is the volume of water moving through the hose, and it is what carries loosened debris down the line and away. A jetter with high pressure but little flow can cut buildup loose without flushing it out.
A careful plumber balances the two for the pipe in front of them. A small kitchen branch, a main lateral and an old clay line with fragile joints each call for a different combination. Running a machine at its maximum is not the same as doing the job well.
Common nozzle types
- Standard or flushing nozzle
- Rear-facing jets that pull the hose forward and scour the walls; used for general cleaning.
- Penetrating nozzle
- Adds a forward jet to open a path through a blockage before cleaning.
- Rotating nozzle
- Spins to sweep the jets around the pipe wall for more even scouring of grease and scale.
- Root-cutting nozzle
- Designed to cut and shred roots growing into the pipe.
- Skid or sled
- A guide that keeps the nozzle centered in larger pipe so jets reach all sides.
How the setup usually changes with the pipe
| Pipe situation | General approach |
|---|---|
| Small branch line | Smaller hose and nozzle, lower flow |
| Main sewer lateral | Larger hose and nozzle, more flow to carry debris to the main |
| Older clay with joints | Moderate pressure, attention at each joint |
| Thin or corroded cast iron | Lower pressure, staged passes, frequent checks |
| Heavy grease | Rotating nozzle, slow retrieval, generous flushing |
Points worth remembering
- Pressure
- Cuts and loosens buildup
- Flow
- Carries debris away
- Nozzle
- Directs the jets for the task
- Retrieval speed
- Slow pullback cleans more thoroughly
- Camera
- Shows whether the setup worked
Questions to ask about the setup
- What pressure and flow will you use for my line, and why?
- Which nozzle will you start with?
- Will you adjust if the camera shows weak sections?
- Do you jet toward the street or toward the house, and from which access point?
Common questions
Is a higher-pressure jetter always better?
No. The right pressure depends on the pipe size, material and condition. Too much pressure on a weak pipe can cause damage, and too little flow can leave debris behind.
Where does the jetter's water come from?
Usually from a hose bib or a tank on the truck. Ask the plumber what they need from you, such as access to an outdoor faucet.
Why do plumbers pull the hose back slowly?
Slow retrieval gives the rear jets time to scour each section of the pipe wall instead of skipping over buildup.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.