A camera pass after jetting documents visible cleaning results and defects that buildup may have hidden. Ask for the video and any limits from access, standing water or visibility. It does not prove every branch is clean, measure remaining wall thickness or guarantee the pipe is structurally sound.
What the second pass documents
The reason is simple. Water rushing out of a cleanout tells you the blockage moved. It does not tell you that the pipe wall is clean, that the debris went all the way out, or that the pipe is sound. NASSCO, the trade body behind many municipal sewer specifications, builds that check into its rules: its lining guideline requires post-cleaning video inspection by trained personnel. The idea carries over to a building drain. Video is useful evidence of what was visible and inspected; it is not proof of unseen wall strength or inaccessible sections.
Facilities Management Insights calls video inspection "a cornerstone of preventive drain care" because it lets technicians spot grease buildup, mineral scale, or root intrusion. The same logic applies after the work. Before cleaning, the camera shows what is stuck to the wall. After cleaning, it shows whether it is gone. If certain areas stay stubborn, the crew can make an extra pass with a different head while they are on site. That last step only happens because someone looked. A remaining deposit can be missed without a suitable follow-up inspection.
What the agreed cleaning should achieve. Ask what deposits the crew is removing and how it will document the result. Video may show remaining grease, scale or roots in visible areas. A rough cast-iron surface is not automatically remaining scale, and safe removal limits depend on pipe condition and the intended work. Discuss any remaining deposits or inaccessible areas before deciding whether another cleaning pass is appropriate.
What the camera can find that the jetter could not
The second pass often shows defects that were hidden under the buildup. Buildup hides defects. A pipe wall coated with grease or scale can look intact from a camera, or from no camera at all, while a crack, an offset joint, or a small break sits underneath. S1E's cleaning guidance says to inspect first because "you'll never know what you'll be up against," and the logic runs both ways: once buildup is removed, the inspector may get a clearer view of surface defects. Visual inspection alone does not determine remaining wall thickness or structural capacity.
That makes the after-pass more than a receipt. It may provide the first clear view of previously obscured areas. Things it can reveal include:
- Cracks, breaks, or a collapsed section, which cleaning cannot fix. See signs of old and failing pipes.
- Offset or separated joints, where roots and debris get in and where a line can hold water.
- Root entry points, which can help explain a blockage and recurrence risk. See whether jetting keeps tree roots from coming back.
- Low spots, or bellies, where water and solids collect. A low spot is a slope problem and cleaning only resets the clock.
- Remaining scale, especially in cast iron. See cast iron descaling.
- Damage the cleaning itself caused, which is why the camera comes before and after. NASSCO's lining guideline makes damage caused by cleaning equipment the contractor's to repair, and requires post-cleaning video. Read whether hydro jetting can damage old pipe.
A good crew notes anything unusual after jetting. The camera is how they see it.
How defects get ranked. Sewer inspection reports often use a standard grading language from NASSCO's Pipeline Assessment Certification Program, known as PACP. NASSCO's tech tips, published in Underground Construction, explain that PACP condition grades are assigned as either structural or O&M (operations and maintenance) grades, on a scale of 1 to 5, where 1 is a minor defect and 5 is the most significant. You may not see grades on a routine building-drain visit. If a report does use them, ask the inspector to explain what each finding means and whether it is a cleaning question or a repair question.
Before and after, and why you want both
The two passes answer different questions.
| Pass | Question it answers |
|---|---|
| Camera before jetting | What visible buildup and defects can guide the cleaning plan, and what further assessment is needed? |
| Camera after jetting | What cleaning results and defects are visible in the inspected sections? |
The before pass helps set the plan. Visible defects, material, access and operating limits help the crew choose a method; camera footage alone cannot establish that a pipe is safe to jet. That is the same inspect-first rule S1E gives. Our page on what happens on a commercial drain cleaning call shows where both passes sit in a full visit.
The after pass closes it. Together they give you a comparison. If you keep the videos, the next crew can see what the line looked like before and after the last cleaning, which shows whether it is filling faster or slower than expected. That history also helps when you set a cleaning interval. Our page on what a sewer line maintenance contract should cover explains why a camera baseline is the starting point for a schedule.
Municipal lining specifications take the same approach. NASSCO's guideline for cured-in-place pipe requires post-cleaning video inspection by trained personnel and says the owner gets both the pre-cleaning and post-cleaning video for review. Our page on why pipe is jetted before it is lined explains what those specifications require. A building owner is not a city, but asking for the same paper trail is reasonable, and cost and time on the visit are modest next to what a hidden defect can cost.
What it means for you
Ask for the second pass every time, and ask what you will get from it. If you are a restaurant manager, a property manager, or a building owner, the second pass protects you in three ways.
- 1You get visible evidence. Video documents the inspected areas and should identify its limitations.
- 2You find out about damage early. A crack found during a scheduled visit is a planned repair. A crack found during a backup is an emergency. See pipe bursting versus pipe lining for what repair can look like.
- 3You have a record. For a restaurant, that record supports the Food Code's requirement that the plumbing be maintained in good repair. See restaurant plumbing and health inspection requirements.
Before you book, ask:
- Will you camera the line before and after, and will I get the video?
- What will you do if the after-pass shows remaining buildup?
- Who decides whether a defect needs repair, and how will you show me?
- Can I keep the files for my building records?
A crew that will not camera the line afterward is asking you to trust the flow at the cleanout, and flow alone cannot tell a clean pipe from a partly cleared one. If the crew cannot run the second pass that day, ask for a scheduled return visit for it, and agree on what record and follow-up the job includes. HQ offers hydro jetting and commercial drain cleaning with 24/7 emergency service, free estimates, and the price given up front, before work starts.