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Old 12-11-2010, 01:38 PM   #1
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Sewer Gas

Recently we are having trouble with sewer gas in our 2010 33 ft Georgetown. We have emptied the tanks and backflushed but we are now experience sewer gas - it usually happens in the morning. We have checked the sewer release valves and the are closed tight. Could it be the seal on the bottom of the toilet tank? Any ideas. It might last a few hours and then it seems fine until the next day.
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Old 12-11-2010, 03:39 PM   #2
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There are numerous threads here on this problem.

Give a search on: smell, odor, etc.

It may be gray tank odor from a dry trap, too.
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Old 12-11-2010, 03:40 PM   #3
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What about your roof vent. Is the wind pushes the smell inside the vent. Also you may have a problem with your toilet vent connection that is not airtight.
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Old 12-11-2010, 03:47 PM   #4
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ANOTHER PROBLEM THAT I HAD ON MY TERRY TAURUS LONG TIME AGO. tHE ROOF SEWER VENT WAS LOCATED RIGHT NEXT TO THE BATHROOM VENT. WHEN THERE WAS A WIND RUNNING IN THE DIRECTION OF THE CEILING VENT THE ODOUR FROM THE SEWER PIPE WAS HEADING INSIDE THE VENT. I INSTALLED AN EXTENTION TO THE 2 INCHES PIPE AND AFTER THIS THE SMELL WAS GONE.
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Old 12-12-2010, 08:03 AM   #5
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It's a mis-conception that the typical RV potty is air tight.
They aren't.
I actually called Thetford about this very problem when my
current trailer was new.
I talked them into shipping me a new unit --free--.
I was convinced that my first one was defective.
(And it had that stupid hand lever flush which we both hated.)
They sent me a brand new foot flush unit and I swapped them out.
No change.
If you are running a vent fan inside anywhere in your RV and don't
have a window open you are creating a negative pressure inside
and you will draw the stink out of the holding tank.
No amount of cleaning can get all the odor out of the tank.
You have to stop creating the negative pressure.

(PS. I have an almost brand new hand flush Thetford
toilet for sale Ęheap if anyone is interested)
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Old 12-12-2010, 09:49 AM   #6
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Terrific Tip

"If you are running a vent fan inside anywhere in your RV and don't
have a window open you are creating a negative pressure inside
and you will draw the stink out of the holding tank." KyDan

I think I remember reading in the Power Vent manual that a lower window in the corner furthest from the vent must be open in order for there to be a cross breeze through the camper.

This is another GREAT reason to do so.
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Old 12-12-2010, 02:03 PM   #7
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hmm the 2" extension on the sewer pipe is a nifty idea.
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Old 12-16-2010, 11:15 PM   #8
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Sometimes a persistent sewer gas odor will be due to a crack in a vent pipe which may be located inside a wall. I would rule out any other causes first as it will be a challenge to find. If you pressurize the system (perhaps with the blower of a vacuum cleaner) after plugging up the drains and vents it may help you to locate the problem with your nose or perhaps your ears if the crack is large enough.

Mike
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Old 12-17-2010, 09:22 AM   #9
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Hi blackshadowk1937. Do you use Calgon in your holding tanks? It will surely help matters by making the inside tank walls slippery, thereby making a more thorough dump, when it comes time to empty the tanks. Just add a capfull and a gallon or so water to the tanks after emptying them, or upon arriving home. Then, when you drive to your next campground, the solution will be allowed to slosh around in the tanks, coating them with the Calgon, making the tanks non-stick. This really helps most of us on this forum that do this regularly. Randy
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