Start with the decision the image must support
Useful questions include whether a recurring blockage has a visible entry point, whether a repair location can be narrowed, or whether a cleaned line shows a condition that changes maintenance or repair planning.
If the result would not change the next step, inspection may not add value yet.
A blocked or dirty line can hide the answer
Standing wastewater, heavy deposits, and poor access can prevent a clear view. Cleaning or establishing safe access may need to come first.
A camera records what is visible at that moment; it does not measure every leak, prove slope throughout the run, or identify material outside the field of view.
Ask for usable documentation
The value increases when the footage, location method, observed condition, and limits are explained together. Avoid treating an isolated image as a complete diagnosis.