Probably underneath somewhere. it sounds like you have a leak around the drain hole. Larvae are displaced by the soaps etc going down & trying to get away from it. You should have an access to Plumbing underneath from ext. Check it out with a flashlight. If you are seeing small flies, then you may have found the source.
There really is no easy way. You can go to a hardware store and buy a bug bomb that sprays bug repellent into the air. You need to be able to seal off the bathroom and open a window in the bathroom. I had to use one of these once and they leave powder all over the room. But it is really easy to clean. The room I had to remove all bugs from was carpeted and I just used a vacuum to clean it up. I don't know if you can see the larvae, but if you can just spray them.
Eliminate the moisture and they will die out.
disinfect thee bathroom with water mixed with salt
do i need a sray to kill the worms
moth balls
Does bleach eliminate drain odors
Sewer flies are also called drain flies. To get rid of them you have to first clean the drain. Use a pipe brush to do this. Follow the cleaning by pouring some gel drain cleaner down the drain.
store..... eliminate.... make..... spray.....
By checking the vent to make sure its working and that no one installed an AAV
You would have to build a platform for the tub to sit on. About 3 inches if you are using a floor drain. There is a trap right after the floor drain so you would not need one at the tub. If possible you could position the tub directly over the floor drain but that would eliminate the floor drain which would be a problem if the basement every flooded.
Carcengenic fruit flies
Dragonflies help to eliminate more prolific bugs from the environment. Mosquitoes and flies are the primary insects eaten by dragonflies.
Yes, if you do not use them often and have poured sugary substances down the drain.
I've heard nicotine repels aphids.. could it repel fruit flies in the drain system?
Keep the business and garbage areas clean and eliminate possible entry points.
If you look at the pipe that is going into the filter pump you will notice that it has a tee that is peceeded by two or three pipes comming up from the ground. Those will be from the skimmer, main drain, and if you have one from the cleaner. If you observe the flow of water in the skimmer then change the valve so there is no more water flowing that will be the one going to the main drain or cleaner. Repeat the process to eliminate which one is the cleaner. Which ever one is left is the main drain.
Yes, the air vent (air gap) is very much required!! It prevents water from traveling from the sink drain pipe or garbage disposal and into the dishwasher.