Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 01-03-2015, 02:47 PM   #1
Junior Member
DougWHolt's Avatar
Join Date: Feb 2013
Location: Deland, FL
Posts: 21
Blog Entries: 1
Gnats flying out of the septic tank into RV

I'm trying to resolve and find a solution for the pesky Gnats that fly in from the septic. Usually by now the winter cold has killed them off but it's a warm winter in FL this year. I've tried doing a google search. The internet is inundated with others looking for a help but no solutions.Yeah, some mention getting fly gnat traps and they do help but it's still several flying around. I'd like to resolve this at the source. Is there anything we can add to the tanks?


1996 Four Winds Majestic (identical to the Hurricane model)
Chevrolet P30 Chassis W/ 454 7.4L TBI
VIN: 1GBKP37N5S3******
DougWHolt is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-03-2015, 02:52 PM   #2
Community Administrator
Clifftall's Avatar

Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Aug 2009
Posts: 30,746
Heres a link to some previous threads that may give you some answers.



Cliff,Tallulah and Buddy ( 1999-2012 )
Clifftall is offline   Reply With Quote
Old 01-04-2015, 04:17 AM   #3
Senior Member
Join Date: Apr 2014
Location: Des Moines, Iowa
Posts: 247
I'm actually in the pest control business and have also had these flies invade my black tank. In my case they were "drain flies" and likely what you have too. Below is a link that explains it better than I could. I went to a dump station and did the dump and rinse 5-6 times, solved the problem.

The RV Doctor: Frustrating Fly 'Festation' with RV Toilet

Robby W. is offline   Reply With Quote
Old 01-04-2015, 05:48 AM   #4
Senior Member
doc's Avatar
Appalachian Campers
Join Date: Sep 2002
Location: Dixie !! (north Georgia) USA
Posts: 3,022
Keep the dump valves closed until you dump.
doc is offline   Reply With Quote
Old 01-04-2015, 07:10 AM   #5
Senior Member
Pepper2's Avatar
Winnebago Owners Club
Join Date: Nov 2011
Location: Roaming the West
Posts: 2,308
Start using Happy Camper in your black tank.
Neal and Deb + Mya and Gizmo, the pup's
2003 Winnebago Sightseer 30B

May the roads rise up to meet you, May the winds be always at your back...
Pepper2 is offline   Reply With Quote
Old 01-04-2015, 09:05 AM   #6
Senior Member
Grey Ghost I's Avatar
National RV Owners Club
Ford Super Duty Owner
Join Date: Sep 2014
Location: Georgia
Posts: 588
I think these are the tiny moths that plague wastewater treatment plants. Their solution is or was to flood the ww filter and flush them away. If I had them in my moho, I would try putting a cup or two of bleach in the tank. The ww people call them "filter flies".
Jerry and Barbara,
2005 Nat Sea Breeze 1321
2010 Honda CR-V toad
Grey Ghost I is offline   Reply With Quote
Old 01-04-2015, 10:03 AM   #7
Senior Member
Join Date: May 2012
Posts: 1,133
Never leave your tank valves open unless you are flushing them, then close them immediately.
Jake21 is offline   Reply With Quote
Old 01-04-2015, 11:51 PM   #8
Senior Member
Ray,IN's Avatar
Join Date: Aug 2001
Location: North America somewhere
Posts: 13,912
Create a water trap in the drain hose. I always place a block of wood under the slinky between the RV and septic drain to make one if the septic dump is not higher than the ground. Anything to hold water in the hose.

2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
Ray,IN is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Do I need the expansion tank for water heater? Lemon Twist Class A Motorhome Discussions 13 05-22-2016 06:32 AM
Piggy back a larger propane tank? Softail96 RV Systems & Appliances 9 11-15-2014 05:25 PM
Fresh Water Tank Sensor Fell Off BPoland Newmar Owner's Forum 5 10-29-2014 06:28 PM
Closet Flange Connection to Black Water Tank micalk Vintage RV's 4 10-22-2014 04:59 PM
Palazzo fuel tank and fuel gauge Deucerod Palazzo Motorhomes 14 08-20-2014 09:33 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:52 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.