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Old 10-23-2019, 06:55 AM   #1
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Sewer Flea Trap??

If you know of a successful means of trapping these little, irritating suckers, please share. Thanks.
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Old 10-23-2019, 07:05 AM   #2
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Fill youir tanks to the brim with water. Let it sit and let them drown.
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Old 10-23-2019, 07:10 AM   #3
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Never heard of fleas in the sewer. On the dogs now, different story
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Old 10-23-2019, 07:28 AM   #4
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Read my posting "Poop Shoot P Trap" above yours.
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Old 10-23-2019, 07:43 AM   #5
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Read my posting "Poop Shoot P Trap" above yours.
I did....however, without saying so I was thinking more along the lines of trapping them after they managed to make their way into the people living area.
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Old 10-23-2019, 07:48 AM   #6
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If you are using the camper part time, next time it's parked long term, leave the waste valves open. Once the tank dries out the gnats will disappear.
We full time and have not had any issues w/gnats, but you could try some bleach in the empty tank to slosh around on travel day. The drown theory sounds good for the adults, but does nothing for the larvae.

Note - Living area? Are you sure they are not fruit flies? I had a friend complaining about fruit flies in her house. Then I found a pail of rotten pears in her garage!
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Old 10-23-2019, 08:42 AM   #7
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We keep the black and grey valves closed except when dumping the tanks and have never had that problem.
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Old 10-23-2019, 08:56 AM   #8
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They usually come form leaving a gray or black valve open (which you should not leave black valve open) at campsites. They are sewer gnats, not fleas but we get it. I always close all my valves except when dumping and I've never "caught" them. I also Clorox my tanks occasionally. Never had issues from doing that.
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Old 10-23-2019, 09:00 AM   #9
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Pour soapy water down the drain. Soap sticks to them and they breathe through their skin. Suffocating them. If in the RV, a small cup of apple cider vinegar with a few drops of Dawn in it. Cover with plastic wrap and poke a few holes in the top of the wrap for them to get in. Works good.
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Old 10-23-2019, 12:09 PM   #10
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Pour soapy water down the drain. Soap sticks to them and they breathe through their skin. Suffocating them. If in the RV, a small cup of apple cider vinegar with a few drops of Dawn in it. Cover with plastic wrap and poke a few holes in the top of the wrap for them to get in. Works good.
^^^^^ This is the answer.

The apple cider trick works great for fruit flies.

Also be sure there's a little bit of water in your toilet bowl and also if you have a bowl with the little holes under the rim for overflow, spray some bug spray in the holes.
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Old 10-23-2019, 02:22 PM   #11
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Never heard of fleas in the sewer. On the dogs now, different story
I don't know...In Texas I saw CG sewer cockroaches big enough to have fleas!
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Old 10-23-2019, 02:48 PM   #12
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I don't know...In Texas I saw CG sewer cockroaches big enough to have fleas!

We grow 'em big & plentiful.



In the mid 90's working at the Johnson Space Center on night shift, I was walking up to a building. I started hearing crunch crunch crunch with each step. I turned on my phone flashlight & was surprised to see what looked like a brownish blanket, thousands scurrying to a sewer manhole. It looked like something from Raiders of the Lost Ark.


Every night they would emerge until finally exterminated.
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Old 10-25-2019, 10:25 AM   #13
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As was mentioned, it often takes multiple treatments of the tanks to get rid of the flies once they move in. New larvae hatch every day or two, so it may take 2-3 cycles to kill them off. And you can't achieve much inside the RV until you've done that. The eggs & larvae are in the slime on the tank walls and floor, so using a septic enzyme cleaner/treatment can help get rid of them.


Opening the drain valves may or may not help. If the tank totally dries out, the eggs and larvae die, but most tanks have some water left in the bottom plus it can take weeks for the slime on the walls to dry out. If ever.

In the interim, make sure all the drains have water in the traps, so that more flies cannot enter the interior that way. That leaves only the toilet as an entry path.

I've had decent results simply spraying insecticide down through the the toilet. That kills off the adults and 2-4 go-arounds gets successive generations. We like the Bengal brand spray - it's effective on most varieties of critters.
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