ok for maybe one plant
this is yeast and sugar i run 2 of these in flower and see results heres the link if im allowed to post it http://www.invalid.com/general-marijuana-growing/258474-homemade-co2-guide.html also i can run higher temps in my tent :party0042:
this work's but when i say it work's i mean that it dose crate co2 but on the scale shown on the thried it would't make a big difrance with even one plant, peps can think that it dose but it's usaly because they have spent more time with the plant qhicking to see if it dose work or not and when there qhivking on it they might find that the plant could do with more or less water/light/heat, there you get your difrance, or in some case's it's in there head and then you'll get pep's that hav't even grown a thing just on the net talking shit,
the easyest way to up your co2 is to use cardenated water, this will work with out having to moniter the level's, any more and you need a co2 moniter for your plants sake and for your's if your grow is in you home, carbenated water work's like this, you spray on the top and under of the leaf, just when the lights have turned on, i used to use this methed years back untill i found out about home brew beer or sidder, with a home brew you can rase you ppm's buy alot depending on how you have it setup,ie how much or how big a brew you are doing, i could run you thiugh all the ins and out's of how to do it but just at the mo im stoned out of my box, sorry for any bad spelling but if you google home brew for plants you'll find wot you need, this way you make enough c02 and you endup with your owen beer/sidder. an outher alturative to making co2 would be to just hang a fly zapper, ie the ones with ultravilet light, you see a ultravilet light gives off co2, about the same amont that the post with small bottle of sugar fremention gives off, imo i would't bother with fremention unless you have at least a 5galon setup, hope this helps and remmber dont belive all the hipe