Gnats flying out of the septic tank

two things come to mind. one: you do not have a septic tank in your MH. it is a holding tank. the fly's or gnats or what ever they are, are more than likely getting in through the vent pipe at the roof level.

We've had that problem a few times too & we have solved it by emptying & flushing out the tanks well & then filling the black tank completely full, adding a cup of bleach. We let it sit for about 20 mintues or so & then drain, no more flies. Someone once told us that the flies stay at the top of the tank & fly out as soon as the toilet flap is opened & that appears to be true. The flush with bleach water does the trick every time for us. Hope you find something that works, that is indeed yucky when you know for sure where they came from! Becky

Valkyriebush wrote:
I spray flying insect spray down the toilet for a 3 second burst when I see one fly out. No more gnats.

We do the same. Just happened to have some Wasp spray with us the first time. Have to do one burst of spray a season, usually in Late July, August. Seems to do the trick!

They lay (larva, whatever) eggs near the top of the tanks, they need to be drowned. Fill your black tank until you can see water in the mouth of the toilet. Let it sit as long as possible, talking 24 hrs+.

We also had this happen while in Florida- we dumped, flushed and sprayed insecticide down drains and toilet and closed all drains (taped the shower drain) and next morning they were gone. YUCK Not sure where they came from, had brought home some fresh produce, so maybe??

I would think that the a healthy dose formaldehyde based chemical treatment would kill off the little buggers...at least preserve them in a docile state.

Steeljag wrote:
Also a Florida resident and have not experienced this. I can offer no help, but can I assume you have rinsed / flushed / bleached the black tank to get rid of them?

Just curious, do you leave your black tank valve open when hooked up to sewers?

Ive been using bleach when doing dishes and put a little down the bathroom sink and shower to keep them from coming out the drains. But the main source seems to be the black tank. I keep the black tank valve closed. Someone mentioned that the Gnats get in through the roof tank ventilation vent and into the tank where they propagate and swarm. When flushing the toilet they fly out into the house. Its really nasty when they fly up your nose and into your food and drink. Especially knowing from where they originated... I'll try bombing them with flea insecticide after the next dump and see if that helps. Also I may devise some type of screen on septic roof vents, maybe that'll keep them from getting in period.

I spray flying insect spray down the toilet for a 3 second burst when I see one fly out. No more gnats.

Also a Florida resident and have not experienced this. I can offer no help, but can I assume you have rinsed / flushed / bleached the black tank to get rid of them?

Just curious, do you leave your black tank valve open when hooked up to sewers?

GNAT TRAPS. They are very small & difficult to bait, but work well !! :B