I use ffof with 30% added perlite, and 10% ewc for veg, then same soil with added Rainbow Mix for flower when I up pot. Nothing but water no added nutes.
I was using dunks, but not happy with results, and have been adding 1 tsp Bronner's Lavender Soap to 1 gallon water. I have seen less gnats for sure. I think you have to see dozens of flying gnats to have enough of the larvae eating your roots to matter.
I was using dunks, but not happy with results, and have been adding 1 tsp Bronner's Lavender Soap to 1 gallon water. I have seen less gnats for sure. I think you have to see dozens of flying gnats to have enough of the larvae eating your roots to matter.