Fungus Gnat problem , whats the best and fastest way to get rid of them

Hello this is is my second grow and i have a gnat problem , i am currently applyng soap mix i got at the grow shop but its doesnt seem to be working , if anyone knows whats the best way to apply the soap flush the soil with it or apply to the top. Also i heard sand may help or illiminate the problem is that true?

what you need to do is get some DynaRock (silica) and grind it or purchase some dianateous earth and sprinkle it on top of your soil...it cuts up the bugs as they try to crawl out of your soil

i live in spain so that might be hard to find those things, i was wondering if you can use something like sand or coco brick that swells up, what do u think

i put a few drops of normal dish soap in my water bottle i use to water my plants.

proceeded to water as normal and slowly but surely, the gnats died off.

took about a week.

They are a pain in you know what. I tried the soap spray in my water without much luck. I bought some Neem Oil at Home Depot and I am trying that to see if it works.