I tried the gnatrol in my dwc and aero
and it was a disaster.
gnatrol is for soil only.
The only way to deal with gnats is prevention.
Spider mites were early in the grow,
and so I used Bed Lice spray to wipe out the eggs.
Then I sprayed the room
with OrthO Home Defense
Now I spray Home Defense before every grow.
and use the sticky traps to prevent gnats.
I am going to do a better job of sealing the rez,
and then use neopreme covers
around the stem
to seal the net pots.
I'm going to use a lot more sticky traps next time.
I get them on ebay.
they are kind of expensive,
but they are double sided.
.