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Old 11-15-2019, 01:42 PM   #1
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RV Bathroom smell

Hi, we are noticing a smell once we take off to travel, but not when stationary. Thoughts?
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Old 11-15-2019, 01:57 PM   #2
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turn the bathroom fan on when your done..
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Old 11-15-2019, 02:12 PM   #3
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When you empty your waste tanks, do you add 5 gallons of water back in the tank? That will help with odors when traveling.
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Old 11-15-2019, 02:48 PM   #4
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Don't travel with the roof vents open. Make sure there is a little water in the toilet, just enough to cover the bottom.
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Old 11-15-2019, 03:07 PM   #5
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Make sure there is water in the shower and basin traps to stop odor from the grey tanks.
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Old 11-16-2019, 04:54 PM   #6
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We pour fablousa (no sure of spelling), in all sinks commode and sometimes pine sol.
Have you checked roof top vents for obstruction and cleaned all p traps
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Make sure there is water in the shower and basin traps to stop odor from the grey tanks.
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Old 11-16-2019, 05:13 PM   #7
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Do you have vacu-flush? Keep some water in the bowl.
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Old 11-16-2019, 05:15 PM   #8
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When sitting still and you turn on a vent fan, do you get odors? If so, perhaps your air admittance valves under your sinks are faulty. If you have a black tank flush system there is a vacuum breaker in the line that may be faulty allowing odors into the rv.
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Old 11-16-2019, 05:21 PM   #9
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Do you have hookups for washer? Make sure the trap is full there too - that is straight into the grey tank.
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Old 11-16-2019, 09:59 PM   #10
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Depending on your rig (we need more info, perhaps you will want to add such to a tag for your posts). My 1997 Fleetwood Bounder had a terrible odor once we used it for a weekend. Driving home was sickening, didn’t matter whether we had windows cracked, vents open or closed. Installed the Venturi caps on both gray and black vents on top of roof and problem was 100% solved.
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Old 11-18-2019, 02:13 PM   #11
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Camco makes some venturi vent caps I'll be installing soon.
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Old 11-18-2019, 03:04 PM   #12
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Do you have hookups for washer? Make sure the trap is full there too - that is straight into the grey tank.
This. ^^

Friends, w/a Discovery, found that because they NEVER used the washing machine, the trap was dry & allowing a septic odor inside.
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Old 11-18-2019, 03:38 PM   #13
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In many motorhomes the P-Trap under the shower is really shallow. Even if it has water in it there might be enough pressure from a wind gust to force a bubble of bad smelling stuff from the tank into the coach.

I've used these on my last two RV's and problem totally solved.

https://www.amazon.com/Camco-40597-B...46971080&psc=1
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Old 11-18-2019, 06:11 PM   #14
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Check the in-line vents for the sinks. We had the same problem this summer and replacing these vents solved it completely. We got Oatey 39012 ABS In-Line Vent 2X2 13/16 from Amazon, dirt cheap and easy to install. Look at the piping under the sinks and you should find them next to the drain line. These go bad and don't seal allowing the tank stench into the coach when moving. Just unscrew them and screw on the new ones. I didn't even need any tools, they came right off.
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