c02

how long do i let it run for/do i stop at a sertin week?

Calculate your room area and run it according to a CO2 calculator. I think there is a calculator in the tool forum or section if not do an internet search. I turn it off when I cut down the lights to flower (first 12/12) for that 2 weeks after that I raise the amount to over the suggested amount just to make sure until till the final week when I stop using it again (waste). Don't do it so much you gas your self

Like I said, I think there is a calculator under the tool section (or something like that) on these forums.

only when lights are on and fans off

so i let it run for 12 hours non stop all 8 weeks of flowerin??

pittbull5940 said:

so i let it run for 12 hours non stop all 8 weeks of flowerin??

Click to expand...

No, it needs to be set harmoniously with your extraction fans so it doesn't waste it. This shit is expensive. Calculate the co2 stuff using this link....

http://www.hydroponics.net/learn/co2_calculator.asp