Which of the following is not a direct use of closed-circuit TV by wastewater workers?

• A. Chemical addition
• B. Evaluating cleaning effectiveness
• C. Inspecting lateral connections
• D. Removing infiltration

Answer: (A)

Closed-circuit TV in sewer maintenance is used as a visual inspection tool to see inside pipes and assess conditions firsthand. It lets workers judge how well cleaning has worked by looking for remaining debris, verify the condition of lateral connections, and locate spots where infiltration or other defects are entering the system. These are direct uses because the camera provides the actual visual evidence needed to perform or verify those tasks. Adding chemicals, on the other hand, is a dosing process handled by separate equipment that introduces substances into the flow; the camera doesn’t perform or control any chemical addition. While CCTV can help pinpoint infiltration so crews can repair or mitigate it, the act of removing infiltration isn’t done by the camera itself.