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Old 09-28-2012, 10:42 AM   #1
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Problem with toilet odor

We have a '97 Discovery mtrhome...and we cannot seem to eliminate toilet odors. Does anyone have any suggestions for this problem? Is it a common problem with Discovery motorhomes, or???
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Old 09-28-2012, 11:03 AM   #2
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is this a new problem? does the toilet bowl hold water between flushes? if not you need to replace or clean the seal. do all of the traps have water in them? do you have a washmachine hook up? no I do not think it is a common problem with your Discovery. you just have to figure out how the smell is escaping the tank. is the toilet secure to the floor or does it wooble?
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Old 09-28-2012, 01:15 PM   #3
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Sorry your in with a problem right off the bat.
Black and grey tank odors are the bain of RVers existance. The problems can exist from the factory; poor plumbing joint assembly; or be the result of wear and tear on the systems over time.
As, mikf, asked is this a new problem or is the coach new to you?
Does the problem take a few days to develop, or is it constant?
Are you hooked up to services or are you boondocking?
Tried anything yet ?
Checked the tank venting, through the roof ?
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Old 09-28-2012, 06:28 PM   #4
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Could be a grey water tank problem - often due to the fitting below the bowl staying open and letting the odours escape.
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Old 09-29-2012, 12:39 PM   #5
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Tony is right, that is a common problem.
The fitting is called an air admittance valve and it prevents the water from being sucked out of the traps by opening and allowing room air in the line. If the flap sticks in the open position, gray tank odor can enter the room. Gray water can smell as bad if not worse than black.
The valves are usually hand tight and can be unscrewed pretty easily. It is on a stub that is connected on the sewer side of the trap on the sinks.
Replacements can be bought at many hardware stores.
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Old 09-29-2012, 12:43 PM   #6
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I started using this and the odor went away. Odorlos Waste Chemical - Product - Camping World
And as others have said make sure you keep water in the toilet bowl.
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Old 09-29-2012, 02:14 PM   #7
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Chemicals, in and of themselves, will not eliminate odors. Had one problem with an AAV under the sink in the bathroom (replaced valve - problem solved). Have never used chemicals. Make sure there's water in the toilet bowl/p-traps and your vents will take care of the rest.
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Old 09-29-2012, 08:12 PM   #8
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I installed this and it works great. I would start to get odors after 4 or 5 days after dumping. I would get the odors when I flushed,
No odors since I installed this.

Lil' Stanker™ In-Line Deodorizer Fans
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Old 09-30-2012, 05:05 AM   #9
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If you get them going down the road make sure your roof vents are closed. If open they'll suck the smell up out of the toilet and the sinks.
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Old 09-30-2012, 06:56 AM   #10
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Welcome to irv2
After checking the previous posts maybe you need new vents that are under your sinks the rubber may have dried out and needs replacement.
If your toilet bowel doesn't whole water the seal needs to be cleaned and always make sure there is water or RV anti freeze in bowel to prevent a dried out seal during winter months.
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Old 09-30-2012, 07:14 AM   #11
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If all else fails, remove the oem vents on the roof an replace them with cyclone vents. Had the same problem, replaced the oem vents no more problems.
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Old 09-30-2012, 02:03 PM   #12
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Questions: Are you using chemicals in the black and gray tanks? Stop.

Are you hooked to a sewere system and leaving the dump valves open: Close them.

Finally a suggestion:

Odor is more a problem with the gray tank than the toilet. Under the sink (Both kitchen and bath) may be a vacuum breaker, it can fail and let sewer odor back into the room.
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