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Old 07-02-2013, 12:10 PM   #1
Join Date: Oct 2012
Location: Granbury, Texas
Posts: 79

We have gnats flying around our toilet seat.

We have an 8 month old, 2012 Redwood RV (bought new). The toilet has never seemed to have a good seal to the point it will hold water in the toilet bowl. The seal has been replaced and within 2 weeks or so the seal was gone again.

We do all the black water steps we're supposed to (we beleive). Keep it closed, chemical pouches, water, RV safe t-paper, empty every 5 days or so, flush the tank weekly with the internal flush mechanism, etc.

Any idea what is causing this? Any idea on how to fix this? Pretty gross to walk in to use the bathroom and have gnats flying around.

Gary and Karen Allison
Granbury, Texas
Redwood 39MB, Ford F-350 Diesel, 4X4 Dually
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Old 07-02-2013, 12:21 PM   #2
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Sounds like you have sewer gnats and I have had problems getting rid of them. One thing that will help is take a small bowel put some vinegar in it with a few drops of dishwashing liquid in it. Then caver the top with plastic wrap and hold it on with a rubber band or something. Punch several holes in the top and sit it in the area where the gnats are. They will go after the vinegar and be trapped and drown. This has helped us.

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Old 07-02-2013, 01:51 PM   #3
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Do you have any plants in your RV? Gnats live in plant soil and will fly around at night. They will go anywhere there is water. If you have any plants, get rid of them. Getting rid of the gnats in the plants if very difficult. Phillip
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Old 07-03-2013, 05:06 AM   #4
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I would agree that its almost certainly "sewer gnats" from what you describe. They really are not that big of deal or that unusual, and you might have picked them up anywhere you stayed.

We have FTed for 6 years, and have on occasion experienced this phenomenon. They live in the black tank, thus the fact they are circling the toilet, or show up when flushing etc.

You should be able to get rid of them relatively easily with nearly any black tank additive you use. I think the trick is to use an additive, and then try not to empty your black tank until its completely full. Or, if your not using your rig for a bit, fill the black tank up, again with an additive, and let it sit for a few days. The issue is the eggs, which need to be destroyed. Nearly any additive will do this, or even a half cup of bleach diluted with the water you put in the tank.

If your seals not working, you will also want to just scrub the bowl real well to get anything that may be in there. We don't normally ever use any black tank additive, water is the best there is. But on the rare occasion where we see sewer gnats, we use it to kill them off. Normally, if you do as you have been, letting your black fill before dumping, use lots of water, and flush well after each dump, you won't have an issue. But once you have these, you need to kill them off and get rid of the eggs.
Good luck
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Old 07-05-2013, 12:15 PM   #5
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Had this problem at the YMCA where I work. All I did was to fill the drains with bleach, let it sit over night then flush them. As was said before, fill the black tank all the way to the top, after you have put in some bleach. Two cup fulls should do the trick. Next day, dump the tank and use the normal chemicals in it. A friend of ours used a battery vacuum to suck them out of the air.
Steve & Trudy
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Old 07-05-2013, 12:31 PM   #6
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Maybe try one or two of the suggestions posted on the Internet?

Just a thought
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Old 07-05-2013, 12:35 PM   #7
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Do you leave your black valve open? If you do you will have sewer gnats.
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Old 07-07-2013, 09:50 AM   #8
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Thanks for everyone's feedback.

It appears the gnats are gone for now. Maybe we were emptying and flushing the black tank too frequently. We left it closed for a bit longer and added PineSol, in addition to the normal packets we use.

Seems to have done the dirty deed. Thanks
Gary and Karen Allison
Granbury, Texas
Redwood 39MB, Ford F-350 Diesel, 4X4 Dually
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Old 07-07-2013, 10:03 AM   #9
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Originally Posted by 336muffin View Post
Do you leave your black valve open? If you do you will have sewer gnats.
The same goes for grey tank. That is how I got them.

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