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How much h202 to kill fungus gnat larvae?

Hydroponics / Aeroponics
How much h202 to kill fungus gnat larvae?
I'm in deep water culture hydroponics, NOT soil! How much 3 percent hydrogen peroxide, with how much water do I dilute to kill fungus gnat larvae? I read online 1 part hydrogen peroxide per I think it was 3 or 4 parts water. I tried that on my northern lights in my hydroton and it literally fried her and killed her. Don't want to do the same thing to my pineapple express. Help please

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