sewer line water jetting

https://magic-wiki.win/index.php/Understanding_Plumbing_Code_Compliance_NY:_What_Homeowners_Should_Know

When a sewer line gets clogged with grease, roots, or debris, water jetting sends a high-pressure stream through the pipe to blast away blockages and clean the walls. It's like a power wash for underground pipes, and crews often use a specialized nozzle on a hose to push through and flush out the nastiness. This method is faster and less disruptive than digging up the line, and it helps prevent backups and overflows.