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[narrator] The tougher chunks
of fat and meat require a blast
of pressurized water
known as a back flush
of fat and meat require a blast
of pressurized water
known as a back flush
Full Transcript
00:00:01.000 --> 00:00:02.075
[narrator] The tougher chunks
of fat and meat
00:00:02.793 --> 00:00:07.203
require a blast
of pressurized water
known as a back flush.
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Movie Summary
An up-close look at the heroes that keep America's sewer systems running.