What does "rodding" a sewer pipe most likely refer to?

Rodding a sewer pipe refers to the process of cleaning it out using a long, flexible rod, often equipped with various cleaning tools or attachments at the end. This method is commonly employed to remove blockages, debris, or built-up materials from the interior of the pipe, ensuring proper flow and reducing the risk of backups.

This technique is essential in maintenance because sewer pipes can accumulate sludge, grease, tree roots, and other obstructions over time. By using a rod to clear these blockages, sewage treatment workers can help maintain the efficiency of the sewer system and prevent more severe issues that could arise from untreated clogs.

The other options refer to activities that do not involve the actual process of physically removing blockages. Inspecting for damage involves a different set of techniques and tools, while sealing leaks pertains to repair and maintenance, rather than the cleaning function that rodding serves.