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Old 07-17-2019, 05:14 AM   #1
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Default Black water odor while driving

I have a 2016 Mercedes Galleria and everytime I drive it it smells like black water inside the unit the bathroom doesn't smell I'm not sure where the odor is coming from? If anyone has any tips or help please help. Thank you
Is there some type of valve on top of the tank?
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Old 07-17-2019, 11:23 AM   #2
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I have a 2016 Mercedes Galleria and everytime I drive it it smells like black water inside the unit the bathroom doesn't smell I'm not sure where the odor is coming from? If anyone has any tips or help please help. Thank you
Is there some type of valve on top of the tank?
There's a vent up top, but no way to close it.

Try adding one of the commercial black tank additives that has odor control properties. Some folks say that Downy fabric softener, when added to the tank, will help control odor. I've never tried it, as I have not had an odor problem with mine.
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Old 07-17-2019, 11:33 AM   #3
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Originally Posted by Windowsofaspen View Post
I have a 2016 Mercedes Galleria and everytime I drive it it smells like black water inside the unit the bathroom doesn't smell I'm not sure where the odor is coming from? If anyone has any tips or help please help. Thank you
Is there some type of valve on top of the tank?
Do you mean a Coachmen Galleria built on a Mercedes Sprinter?

It would assist your question if you could tell us the make and model of your commode that was installed (it's in your paperwork). Your issue may have less to do with the vent, and more to do with the lower plumbing. Some of us have had this type of issue on other models.
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Old 07-17-2019, 01:36 PM   #4
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Grey tank water smells pretty bad and that comes from the floor drain. You have to keep the U trap filled with water as it evaporates out or more likely jostles out from driving especially in hilly or mountainous country.

If your toilet tank holds a modicum of water it shouldn't smell unless you haven't cleaned around the toilet. Using a toilet number 1 or 2 can produce mist that lands on surrounding surfaces. If you don't use your wet bath to shower in, both these conditions can arise quickly.

The vent could be the culprit, but that is the last thing I would check.
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Old 07-17-2019, 01:50 PM   #5
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Quote:
Originally Posted by DUTCH in Atlanta View Post
There's a vent up top, but no way to close it.

Try adding one of the commercial black tank additives that has odor control properties. Some folks say that Downy fabric softener, when added to the tank, will help control odor. I've never tried it, as I have not had an odor problem with mine.
I disagree.
The LAST thing you would want to do is to close the roof vent. It is there to prevent odor problems, it does not cause them.

A properly-operating sewage system (in your van or in your house) will not smell. If yours does, either you have dry traps or there is a leak. No magic additive will fix the problem. You need to track it down and fix it. Your holding tanks do not need additives. They are palliative at best.
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Old 07-17-2019, 07:28 PM   #6
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Did I advise closing the roof vent? Please try to read my response without getting your ego and emotions in the way! Thanks.
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Originally Posted by DUTCH in Atlanta View Post
There's a vent up top, but no way to close it.
Please consider taking responsibility for what is plausibly inferred from your choice of words and not just their literal meaning.

And, please consider refraining from responding to an attack on an idea with an attack on a person.
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Old 07-17-2019, 08:21 PM   #7
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Quote:
Originally Posted by Windowsofaspen View Post
I have a 2016 Mercedes Galleria and everytime I drive it it smells like black water inside the unit the bathroom doesn't smell I'm not sure where the odor is coming from? If anyone has any tips or help please help. Thank you
Is there some type of valve on top of the tank?
I see you have a run on sentence that confused me. I answered for inside the bathroom. Are you saying it smells while driving from where you are seated in the cab? Or are you saying it smells inside the bathroom?

Avanti is right. There is nothing you can do to mitigate the smell by dumping additives in the tank. That's like running a marathon and putting on under arm deodorant.
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Old 07-18-2019, 11:15 AM   #8
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OP has not yet responded re: his equipment. I have no idea what model of pottie his manufacturer is using. That is an important question.

For the benefit of others who may be interested in this question, some of us have had big trouble with certain models of toilets, especially Thetford. A small and carefully-curated collection of horror stories:

(1) The Roadtrek Life account here (note that this is the venerated DIYer, not the Wendlands).

(2) My account here.

(3) ClassBWarned's account here.

Notably, even though my husband and I upgraded our toilet, our problems still have not gone totally away. They are not as bad as they were with the Thetford, with it's horrific, unconscionable design.

But I still don't have adequate venting. We modified our vent line and upgraded our roof vent to one of those that is supposed to be better at pulling negative pressure via Bernoulli-type effect. As far as I can tell, the only way we can improve further is if we install an active vent (12 volt fan in it) rather than a passive vent. And the last time I checked, there were no longer any of those on the market that were reliable. Edit: And we have not yet prioritized the building of one ourselves (a few owners have done this). Too many other van mods have been in our queue.
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Old 07-18-2019, 12:38 PM   #9
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If the OP's Galleria has the same toilet as the Crossfit/Beyond, it is the Thetford Aqua Magic STYLE II.
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Old 07-22-2019, 03:39 PM   #10
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Default crappy situation

Getting some bathroom oder. Have visited the other threads in this blog on this. Can't seem to pinpoint it. Smelling around the base, I can't detect an odor. It's strongest when I open the lid to the bowl. Bowl holds water so it seems improbable that it's a faulty flapper seal. Not sure if odor can get in
where flush water inlet is.

Thetford Aqua Magic IV. I know, I've read about junk splattering into the body.
Went down into the post-flapper region with a tire brush. Cleaned up some. Didn't help odor.

Vent. My RV often sits under trees in the shade. Desert trees typically have very fine leaves (1/4" and smaller) that drop continuously. My vent tube is open at top. Can stuff plug that tube? Has anyone ever "cleaned" that. Perhaps with compressed air from the top?

Advice ALWAYS welcome!

thx.glenn
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