How to get rid of tons of larvae in ebb n gro

I have a buddy running a c.a.p. ebb n gro 48 site and he has Tons of white gnat larvae. he's used azatrol at 1 ml a gollon for 2 days. Didnt work... any suggestion? these things are a bitch.

anyone? he says some died but not all.

Try supercharging the room with CO2. It needs to be at around 10,000 ppm for a while. This will kill almost anything in there except your plants....it is not ok to be in there. Vent it out, back down to 1500 ppm before going in. This method is better than all the other crap they want to sell you at the stores. If it doesn't work, or you don't have co2, talk to your hydro store guys and see what kind of predatory bugs they can get you that will eat them, and not be a problem to the room later. There are many of them.

tried the co2 thing dumped a full 50 pound bottle there goes 40 bucks and still gnats fllying around. fuckers hide in balls, we've even gona as far as using pyrithrium tr, still no go.

have to go the predator way.

Damn, you pay $40 for 50 lbs??? I go to a welding supply store and it's $22.50!

actually 35.00 or something but damn thats way cheaper i'll look for one near me, good lookin bro