Co2 dispenser

well, it claims it raising grow area to 1200ppm but it neglects to say what size... this is basic math and a big red flag that they don't list it. you need something like 20lbs or more of sugar to feed yeast to do it the DIY way in 1m^2 over ~3mo (actualyl volume is key, so need height, but i read this a long time ago, lol). grow. To give an idea of scale.... so i doubt longevity, i doubt it can maintain 1200ppm based on their lack of info that would be super easy to calculate for anyone that's taken organic chemistry.. no degree needed. the only way to do this right is with a propane or naturagas setup and a regulator with a PPM meter for safety. Something with automatic shutoff related to those ppm, etc etc... sure, you can diy this, but it is more than just adding yeast and sugar. (even that method you want a meter to know you are doing what you want. also consider that when you add co2, you no longer need air exchange. You do want circulation, but pumping co2 out of tent is counterproductive. co2 is heavier and will settle at bottom... but, circulation will take care of that. i wouldn't go half way on this... if you do, do the diy method with sugar and yeast... Look up molar ratio fo the chemical reaction and calculate grams of suger and yeast needed etc to produce necessary amount of CO2 to make a difference..