http://home.howstuffworks.com/home-improvement/plumbing/sewer2.htm
In the link above, there is a video of the show, "Dirty Jobs." In it, Mike Rowe takes on the job of a Septic Tank Technician. It shows how much physical labor actually goes into pumping out the Septic Tanks, and how the technicians use a flashlight and mirror to see into the septic tank to check if everything is functioning correctly. I found the next video even more interesting because Rowe goes into an actual sewage plant. Besides it smelling bad and looking gross, there are serious health problems that could occur while in the sewage plant. When the wastewater started rushing in, their hydrogen sulfide detectors when off. Hydrogen Sulfide paralyzes your senses, and then your breathing. Without the detector, they would pass out and drown. When it started to go off, they had to get out as soon as possible before the hydrogen sulfide started to take its effect on the two men. I found this interesting because I never realized that this job wasn't just dirty, but it was dangerous too.
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