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Old 02-20-2014, 08:15 PM   #1
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Black Tank Smell in Kitchen

Hello All you fellow RVers!
We are boon docking it at a rest stop and have the generator running and mid Coach, at our kitchen sink (and it's not our sink drain) we smell what smells exactly like when we dumped our black tank.
Has anyone experienced this? Any advice you can give would be appreciated.
Thanks so much!!!
Mike & Karen
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Old 02-20-2014, 08:27 PM   #2
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Look under the sink & you will see a waste pipe that ends just under the counter top. It has an "air admittance valve" on the end. These devices are cheap and prone to leakage. Lowes or HD likely have them & usually stock one of higher quality.
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Old 02-20-2014, 08:30 PM   #3
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Right, called an autovent and looks like this:

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Old 02-20-2014, 08:49 PM   #4
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Quote:
Originally Posted by Steve Ownby View Post
Look under the sink & you will see a waste pipe that ends just under the counter top. It has an "air admittance valve" on the end. These devices are cheap and prone to leakage. Lowes or HD likely have them & usually stock one of higher quality.
Steve!!!

THANK YOU so very much! We will look right at it!! YOU ROCK!!! 😄
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Old 02-20-2014, 08:50 PM   #5
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[QUOTE="tkcas01;1936721"]Right, called an autovent and looks like this: [/QUOTE

tkcas01, THANKS for the photo to go with Steve's suggestion!!! Awesome and helpful idea to attach it, as we are newbies!!!
YOU ROCK TOO! 😄
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Old 02-21-2014, 02:40 PM   #6
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Don't be surprised if the odor continues. The smell is likely the grey tank and not the black tank. Grey tank odor is much more "gross" and hard to resolve. I thought it was my vacuum breakers under the sinks, but eventually found that replacing them didn't resolve it. What did was getting the acorns our of the roof vents. Between the birds and the squirrels, they had found a new storage place. Our vents had been changed to cyclone vents which made a great place to store things while it was parked in our driveway. Hope it is just the vacuum breakers in your case. Also consider putting deodorant tabs down your drains. You can start by filling your sinks with water, adding bleach, then draining them all. As in a house, the drains slowly build up "stuff" over time that needs to be flushed out. Flush with fresh water after and evacuate it out of your tanks. Bleach resolves problems, but also can cause real issues with metal parts.
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Old 02-21-2014, 03:01 PM   #7
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Try this for your grey water tank. Next time you are taking the RV out have about 10 gallons of water in the tank. Add 1/4 cup of dawn dishwasher liquid to the tank. Drive down the road. The sloshing action in the ank coupled with the Dawn will eliminate most tank smells. When you get to your destination simply rinse out the tank. It may take more than one treatment if you have a big problem. Good luck.
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Old 02-21-2014, 03:43 PM   #8
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Originally Posted by Florida Panhandler View Post
Don't be surprised if the odor continues. The smell is likely the grey tank and not the black tank. Grey tank odor is much more "gross" and hard to resolve. I thought it was my vacuum breakers under the sinks, but eventually found that replacing them didn't resolve it. What did was getting the acorns our of the roof vents. Between the birds and the squirrels, they had found a new storage place. Our vents had been changed to cyclone vents which made a great place to store things while it was parked in our driveway. Hope it is just the vacuum breakers in your case. Also consider putting deodorant tabs down your drains. You can start by filling your sinks with water, adding bleach, then draining them all. As in a house, the drains slowly build up "stuff" over time that needs to be flushed out. Flush with fresh water after and evacuate it out of your tanks. Bleach resolves problems, but also can cause real issues with metal parts.
The p traps on sinks and the shower should eliminate any smell from the gray tank. Sour and old sink water will smell if not flushed with clean from the traps. The vents are the likely trouble.
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Old 02-21-2014, 03:50 PM   #9
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I use this stuff called Happy Camper its some type of enzyme that work's for both the black and grey tank . I was looking at getting the turbo vents for the top of the rv but thought I would try this first and it works great
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Old 02-21-2014, 04:02 PM   #10
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Happy Camper

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Originally Posted by mikebrls View Post
I use this stuff called Happy Camper its some type of enzyme that work's for both the black and grey tank . I was looking at getting the turbo vents for the top of the rv but thought I would try this first and it works great
I use this powder all the time and it beats anything else we have ever used. Use it and you will be a "Happy Camper" too.......
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Old 02-21-2014, 04:25 PM   #11
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Is your vent open in the kitchen? Most likely the tank vent pipe is within a few feet of that vent with a little breeze in the right direction you'll get that.
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Old 02-21-2014, 05:45 PM   #12
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By the way, What most folks think is "Black Tank Smell" is really Gray Tank Smell, black tanks are not nearly as stinky as most people think.

Grays.. To high heaven.
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Old 02-21-2014, 06:17 PM   #13
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If it's a sulfur smell it could be your house batteries.
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Old 02-21-2014, 08:10 PM   #14
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If it's a sulfur smell it could be your house batteries.
Also could be the water heater sulfur smell from non use. If that's the culprit, flushing the heater will take care of that.
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