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I just heard about this from a buddy of mine and thought I would throw it out there.  My friend has been legally growing in Michigan since the medical marijuana act, anyway I was explaining to him that my plants don’t like 70 degree veg as much as they like 80, he is the one who suggested running at 70.  When I told him this he said that when the temps get over 80 the pores of the plant start closing and that the only way to open them back up without dropping temps is to add Co2.  I don’t know if this is true but not knowing any better I’m going to believe it.  I said I don’t want a Co2 tank in my house and he said to get Carbonated Water with no sodium and spray it on the leaves.  I took a 12 oz can and in my tent which is 5 feet by 6 feet by 6 foot tall I sprayed my plants until my spray bottle was empty.  The plants seemed to like it and I can tell you that there was quite a bit of Co2 added to the air cause it was hard for me to breath.  I’d love to hear others thoughts on this.