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08-27-2016, 12:32 PM
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#1
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Junior Member
Join Date: Jun 2013
Posts: 22
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Sewer flies in black tank
How do I get rid of them. I dump once a week then flush and add new chemicals.
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08-27-2016, 12:35 PM
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#2
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Nov 2005
Posts: 1,430
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To prevent future drain fly infestations, clean your drains (they live there not in the tank) once a week. Start by dumping 1/2 cup salt down the drain. Then dump 1/2 cup baking soda down on top of it. Follow that with 1 cup of plain white vinegar, and let the fun begin.
__________________
08 Holiday Rambler Vacationer XL 38PLT Workhorse R-26 UFO gas pusher,
2014 Cadillac SRX AWD, SMI Smart Box braking system.
https://myrandomviews.com/
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09-09-2021, 12:40 PM
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#3
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Senior Member
Entegra Owners Club
Join Date: Nov 2012
Posts: 8,137
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On my coach they live in the black tank. I know this because they fly out when I open the flush valve to drain the toilet. How do I kill the flies that live in the black tank?
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Marc and Jill, Wellington FL
2013 Entegra Anthem 44SL
2018 Lincoln MKX
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09-09-2021, 12:47 PM
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#4
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Senior Member
Join Date: Sep 2020
Location: Houston
Posts: 341
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Set off a bug spray "bomb" in the outside drain with the dump valve open and them put drip cap on to seal up the drain pipe and tank. Leave for a day and remove "bomb".
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09-09-2021, 01:23 PM
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#5
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Senior Member
Join Date: Apr 2018
Posts: 3,441
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Change your roof vent to one with a screen on it
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09-09-2021, 02:07 PM
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#6
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,518
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Quote:
Originally Posted by rgriff
How do I get rid of them. I dump once a week then flush and add new chemicals.
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Do you leave your grey tank valve open all the time? If so this may be how the flies are getting into your system. Fill and flush your grey tank. Never leave the black tank valve open unless you are dumping your tank. After dumping add 1/4 tank of fresh water.
In the meantime, fill your black tank completely full and let it sit as long as you can then dump it. Close the valve and add a 1/4 tank of fresh water and your choice of chemical(s).
If you suspect the flies are coming in your vent (which I doubt) try wrapping a piece of cheese cloth around the vent cap and secure it with a rubber band or a zip tie.
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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09-09-2021, 04:31 PM
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#7
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Senior Member
Join Date: Apr 2018
Posts: 3,441
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Quote:
Originally Posted by LETMGROW
Do you leave your grey tank valve open all the time? If so this may be how the flies are getting into your system. Fill and flush your grey tank. Never leave the black tank valve open unless you are dumping your tank. After dumping add 1/4 tank of fresh water.
In the meantime, fill your black tank completely full and let it sit as long as you can then dump it. Close the valve and add a 1/4 tank of fresh water and your choice of chemical(s).
If you suspect the flies are coming in your vent (which I doubt) try wrapping a piece of cheese cloth around the vent cap and secure it with a rubber band or a zip tie.
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Go up on your roof and watch your vent. Dozens per hour go in and out.
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09-09-2021, 04:41 PM
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#8
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,518
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Quote:
Originally Posted by shootist
Go up on your roof and watch your vent. Dozens per hour go in and out.
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Funny you say that. I was up there changing a start capacitor in my rear AC Monday which was in close proximity to the black tank vent and I don't recall seeing any flies other than common house flies.
Maybe it's because I take better care of my tanks than the average RV'r.
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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09-09-2021, 04:43 PM
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#9
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Senior Member
Join Date: Apr 2018
Posts: 3,441
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Quote:
Originally Posted by LETMGROW
Funny you say that. I was up there changing a start capacitor in my rear AC Monday which was in close proximity to the black tank vent and I don't recall seeing any flies other than common house flies.
Maybe it's because I take better care of my tanks than the average RV'r.
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I guess common house flies don't count.
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09-09-2021, 04:48 PM
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#10
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,518
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Quote:
Originally Posted by shootist
I guess common house flies don't count.
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They don't count. Their fur was even dry. Couldn't have been sewer flies.
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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09-09-2021, 05:17 PM
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#11
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Senior Member
Join Date: Apr 2018
Posts: 3,441
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Quote:
Originally Posted by LETMGROW
They don't count. Their fur was even dry. Couldn't have been sewer flies.
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09-09-2021, 06:50 PM
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#12
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Member
Join Date: Nov 2017
Posts: 73
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This happened to me after a camping trip… I cured it with the bug bomb. Now I do not leave the sewer hose connected when I’m done dumping and have not had a problem since.
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09-09-2021, 07:49 PM
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#13
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Senior Member
Join Date: May 2014
Posts: 1,124
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Never had the problem, but have seen them when I first hook up at the sewer connection. Once I pull the cap, to connect the dump hose, this is when I see them.
All I do is create a trap in the dump hose with water to stop them from coming up the dump hose. This will keep the little buggers from getting into the black or grey tank….
__________________
Paul and Diane
2017 Entegra Anthem 44B
‘05 Toyota Tacoma- ‘19 Harley-Davidson Roadglide Ultra
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09-12-2021, 05:13 PM
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#14
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Member
Join Date: Oct 2011
Posts: 40
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Quote:
Originally Posted by Flanz
Never had the problem, but have seen them when I first hook up at the sewer connection. Once I pull the cap, to connect the dump hose, this is when I see them.
All I do is create a trap in the dump hose with water to stop them from coming up the dump hose. This will keep the little buggers from getting into the black or grey tank….
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This is how I do it also.
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