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Post Info TOPIC: Sewer flies


RV-Dreams Family Member

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Sewer flies


Looks like we've picked up a family of sewer flies. We don't leave the "stinky slinky" attached when we're not dumping, but somehow they have made themselves at home in the black tank. Any suggestions to get rid of them?

We have gnat traps out, and they seem to get some of them, but there are lots more. We've thought about spraying something down the toilet, but don't know what would be best. Would a pot of boiling water accomplish anything?



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David, kb0zke

1993 Foretravel U300 40'

Build number 4371

For sale



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Boiling water...won’t do anything. I would dump a couple gallons of diluted bleach in a half full tank and fill...then wait a bit before flushing several times. Alternatively 3 gallons of white vinegar and w cups or so of Dawn degreaser dish detergent...that cleans the tank nicely but may not do much for flies. Drown and flush the buggers might be your best approach. 



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RV-Dreams Family Member

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Are you sure they are coming from the black tank?  We've been in a few places the last few months and have very small flying insects around.  Primarily, in Oklahoma, but we've also seen them in Colorado and Idaho.

Terry



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Terry and Jo

2010 Mobile Suites 38TKSB3
2008 Ford F450
2019 Ford Expedition Max as Tag-along or Scout

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RV-Dreams Family Member

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Well, they were coming up from the black tank, which is why I'm guessing they are sewer flies. The gnat traps seem to be getting them, so guess we don't have to worry about them much. They are a nuisance, though.

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David, kb0zke

1993 Foretravel U300 40'

Build number 4371

For sale



RV-Dreams Family Member

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There are many reports on the internet of them, but the help seems to be for parttime RVs, not fulltime ones. Enzyme tank treatments to get rid of the residue in the tanks and boiling water seem to be the solutions. You have to do this over a two week period to get the eggs.

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Bill Joyce,
40' 2004 Dutch Star DP towing an AWD 2020 Ford Escape Hybrid
Journal at http://www.sacnoth.com
Full-timing since July 2003



RV-Dreams Family Member

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Why wouldn't taking a spray can of flying insect killer and spraying it down the open toilet valve for about 20 seconds the then closing it up for a couple of hours?  Or maybe wasp killer which sprays in a stream for several feet. 



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Al & Sharon, 2006 Winnebago Journey 36G, Chevy Colorado Toad

http://downtheroadaroundthebend.blogspot.com/

 



RV-Dreams Family Member

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You can use a mixture of baking soda and peroxide, then rinse with hot water.

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RV-Dreams Community Member

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You can use some kind of organic acid, which does not harm the materials but living organisms will be damaged

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RV-Dreams Community Member

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When I had the same issue, I disconnected everything and cleaned all the hoses and connectors. Then I cleaned them a second time with bleach. I removed all the washers and rubber seals and cleaned them the same way. I poured a gallon of bleach in the empty black tank and a gallon in the empty grey tank, followed by extremely hot water until both tanks were 3/4 full. Then I went for a drive to get that hot bleach water sloshing around in the tanks.

When I returned I went to the park's sewer hookup and sprayed half a can of Raid Flying Insect Killer down the pipe, hitting the sides so they were completely soaked with it. I gave that about 1/2 hour to do its job. Then I hooked everything back up. I was lucky enough, so no flies since then.

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