New trailer, toilet bad odor

[Augustpilot]

New trailer, have been traveling with trailer for 3 weeks, have dumped toilet about 6 times, put hose on built in sprayer to clean. Today when dumping in chemical and gallon of water, we got terrible smell from toilet , I know it is a toilet with black tank but this never happened in our old trailer. Also the gage always show 3/4 full, I know this happens but would sure like to sole the odor problem. Thanks.

[crunchman12001]

I found this product for the black tank treatment. This is the best I have used ( I used to use the pouches, liquids). I let the tank sit for 2 weeks with stuff in it and still had no odor. Give it a try. It cost a little more but I am sold.
Amazon.com: Happy Campers Organic RV Holding Tank Treatment - small jar, 18 treatments for RV, Marine, Camping, Portable Toilets: Automotive

[caper]

Is the black tank flush working properly? If you are flushing the black tank after each dump your gauges should have proper readings and there should be no smell from a new tank. We use the GEO method for odor control in the black tank.

[Bluepill]

Being a new unit, there may be a faulty connection to the vent stack or the toilet.

[fyrdad]

Our toilet was replaced free of charge due to an issue with the toilet allowing black tank smells passed the toilet.
Maybe look into that issue too

[Quasipato]

I would check the vent stack first. It should be venting the smells out of the rv.

[karrun]

Yeah, I don't think you should have a bad smell on a new unit. I'd suspect something with the vent or plumbing.

[rickkey2]

Just a thought , make sure that bathroom vent fan is not on as it will pull the stink up out of the toilet as soon as you hit the flush and open it. I think if you had a vent problem, when you went to dump it would not dump normal. I mean it would run out slower than normal. If your toilet drops straight into tank open it up , hold nose, look inside and stick tank if possible to make sure it really is empty. Good luck please let us know the outcome.

[Restcure]

+1 on the Geo Method.

[Ford1]

I had the same problem at the beginning of last season. I ended up removing the toilet and found that the closet flange gasket was pinched, thus allowing odors to come into the coach. I cleaned everything up sealed all possible areas that fumes could escape through, installed a new flange gasket and it solved the problem. DW has an extremely sensitive olfactory system and she is now happy.

[jimmyhof24]

Originally Posted by fyrdad

Our toilet was replaced free of charge due to an issue with the toilet allowing black tank smells passed the toilet.
Maybe look into that issue too

X2

if it's a Dometic toilet, check previous threads on toilet odor issues. Ours replaced also

[rickkey2]

Sounds like Ford1 has a real good place to start. Sometimes the simple things get overlooked . I know sometimes I overthink things and skip the obvious

[ben31]

I had the same issue. I crawled around sniffing, to see where the smells were coming from (no this was not fun). I finally found the fumes were coming from the back of the toilet. I called the toilet manufacturer and walked through a checklist with them (to include checking to make sure the roof vent was not blocked or plugged). After going through it all, the rep told me to take it to the dealer and Thetford would replace the unit. They asked where I would be taking it and they would send the unit to that location, so it was there, when I got to the dealer.

The toilet was there (even though the dealer almost installed it on another unit) and the new toilet works fine. There was a bad seal in the toilet itself.

Thetford did a wonderful job of taking the time to walk me through their checklist and making sure everything was ready when I arrived at the dealer. I was pleasantly surprised.

[CarolinaGirl]

We had that same problem in our TT, last summer. Ford1 was spot on with the fix that worked for us.

[Scottmarm]

Are you sure it's coming from the toilet??? I had a similer issue and after having tried many solutions menthioned in here, i found that when i had flushed the grey tank it had sifined the water from the P trap in the shower. This was where the foul smell was coming from. Poured water into the shower drain and the smell went away. Try this before changing the toilet.

[rockfordroo]

Originally Posted by Scottmarm

Are you sure it's coming from the toilet??? I had a similer issue and after having tried many solutions menthioned in here, i found that when i had flushed the grey tank it had sifined the water from the P trap in the shower. This was where the foul smell was coming from. Poured water into the shower drain and the smell went away. Try this before changing the toilet.

Siphoning from the shower sounds like your grey tank vent is plugged.

[Skyliner]

Had same issue and all it took was changing DW's diet.

[atcla]

Same problem after only a few uses, used Happy Camper Extreme cleaner and it took care of the problem! Now I make sure to rinse the tank well when dumping!

[ben31]

I think TonyD had, by far, the best recommendation!

[Steinbaum]

We had an odor problem in the previous RV. Going with the simple stuff first, we added water to all p traps. Nope. Really flushed both tanks. Nope.

Stuck this on top of the sewer vent. Problem solved.
Cyclone Sewer Vent - Camco 40595 - Sewer Accessories - Camping World