Sewer flies

Broncohauler · July 30, 2017

We're living in our trailer for the last six weeks while doing a full house remodel.

I'm hooked up to our dump at my house and we ARE on a septic tank. Over the last week we are having sewer flies coming out of the toilet. I am hooked up all the time to my dump, but only open the gate valve for dumping. I'm pretty sure they originally came from my home septic tank?

Any ideas on how to handle this WITH OUT hurting the house septic tank?

I just know tried filling the bowl with water and a cup of bleach, then flushing just the bowl. I'll see what happens in a couple hours.

Dutch_12078 · July 30, 2017

Try putting a wood block under your sewer hose to form a sort of 'S' trap before it goes into the dump port. Or if you have the hose on a support frame just leave a dip in it at the port so there's water trap to block the flies.

Flying Finn · July 30, 2017

Be careful not to put to much bleach in your septic as it will kill the good bacteria. When we get bugs I spray yard guard into the toilet with the bowl valve open then close it when I think the little buggers have had enough. Takes care of them. If they come back...repeat. Like you we only open black tank valve to dump.

Broncohauler · July 30, 2017

Thanks guys.

I'll try some bug spray in the tank.

I absolutely Don't want to kill the good bacteria in the house septic.

Dutch next time I dump I'll try making a pee trap with the sewer hose,Good idea.

lappir · July 30, 2017

If your tank drain valves are closed you shouldn't have any thing coming up the sewer hose into your tanks. The standing water in your hose may provide a breeding ground for insects and such. P-traps are good for inside drains, not so much for outside.

Rod

rpsinc · July 30, 2017

Good they be coming into the tank via the vent pipe?

Broncohauler · July 30, 2017

Pretty sure they came from my home septic.

But they are now breeding in my black tank.

Prety gross when your trying to cook or eat, knowing where they came from.

HERO Maker · August 4, 2017

If you are only finding them coming in to your rig thru your toilet, and you are only opening your black tank valve when dumping, then there should be no way they are coming up your connection to the septic tank. They are probably coming into your tank thru you vent pipe. Not sure why they are coming up into your toilet though. OK. I forgot. I no longer have the ball style toilet anymore (two macerator toilets), so I see how they could come up thru the hole when you flush. What does the top of your vent pipe look like? Is there a cap of some sort on it? Could you put a wire mesh around it to keep the flies out?

HERO Maker · August 9, 2017

Did you discover anything more on your system?

Kirk W · August 10, 2017

On 7/30/2017 at 11:07 AM, Broncohauler said:

But they are now breeding in my black tank.

You would probably get more and possibly even better answers to the question if it were posted in the General Forum since this is an issue that most of us either have dealt with or will in the future. Since I don't own a heavy truck, I seldom read this particular forum.

Broncohauler · August 12, 2017

On 8/9/2017 at 0:32 PM, HERO Maker said:

Did you discover anything more on your system?

Still have problems, but not as bad.

I've tried a small amount of bleach in the tank. And have tried spraying raid in the toilet flap letting it sit overnight.

This weekend I'll try dumping and hosing it out again.

In a couple weeks we're heading to BigBear mt

I'll try filling the tank half full of water and dawn dish soap for the drive up there.

Maybe it will help clean it out.

Pete Kildow · August 12, 2017

Might full the black tank full of H2O for a couple of hours. Then drain and hope it takes them with the water. We had that issue 2 years ago. Ours were getting in from the vent.

Pete