1500 ppm, 5000ppm or 25000ppm -- how do you know, using yeast, a coleman lamp, or soda? There is no formula for these, and environmental issues such as air leaks and temperature would render a formula useless anyway. You could be completely out of the effective range with these methods, making your effort a total waste of time and money. You could also be damaging the plants. You are completely out of control. There's no way to tell without a monitor, and no way to start, limit, or stop the flow without a regulator.

Any way you look at it, the bottled co2 is the way to go.
rodekyll Reviewed by rodekyll on . c02 yes i know i post alot and its just because i have alot of questions and this is basicley all i think about because i find girls a waste of time and figure when i find the rite one ill know (this is due to a revalation i had on acid) c02 i happen to have a large tank of c02 in my grage and can use it but i refuse to pay the 150 dollers for a co2 injector so would i just be abl etp put the tank in my grow room and turn it on low for a few seconds also can i have too much co2 Rating: 5