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[Josh] A reverse flow
is not ideal and we need
to control that carefully
is not ideal and we need
to control that carefully
Full Transcript
00:00:01.000 --> 00:00:03.018
[Josh] A reverse flow
is not ideal
00:00:03.207 --> 00:00:04.657
and we need
to control that carefully.
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Movie Summary
An up-close look at the heroes that keep America's sewer systems running.