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hey guys... ive been growing indoors for 6 years now. i tried everything except co2. does co2 really make that much of a difference if you have good air exchange in the room? do people stop the exhaust fan when using co2? anyway... i was thinking. my friend is using this liquid co2 formula that...

Hey guys. I've been using my 600w HPS light now for 3 years. Had a great little harvest every time. I've been using the SCROG method on 4 plants in soil and a 4'x4' area. I averaged out 450grams at every harvest. Have the carbon filter, fans, inlet, basically everything for a basic set up. But...