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I use co2 and I don't have the air exchange on ( room air going though the filter and than out of the room ) so i get no fresh air when the co2 is on, I thought the reason you change air in your room was to bring in new co2. So while I'm supplying the co2 out of the tank i leave the filter off...

Thank you, but are you saying that if the temps. don't get above 80F 85F, than I should be ok to use co2 all the way through flowing, even the last two weeks? Or are you saying never use co2 in the last two weeks of flowering?

I've heard that you should not use co2 in the last two weeks of flowering, is that true.

does it bother the plant if you give it co-2 during the last 2 weeks of flowering?