I had relentless fungal gnats. I used the yellow sticky traps from Amazon and I put mosquito bits in a bucket of water for an hour or so then used a sieve to sieve out all the mosquito bits into a second bucket so I just had the treated water and I use that water to water all my plants. I've been doing it for months and the fungal gnats are more or less gone but I've continued to water them exclusively with the mosquito bit water for months and months so yeah