Well Im new here But not new to the grow scene . If you want to use this kind a set up better to just make beer or wine its the fermentation of the sugars that produce the co2. and small bottles just wont produce much co2. for small grows a better option would be a baking soda acid generator all that is involed is dripping an acid Ie vinagar into a container of baking soda the chemical reation is a foam releasing co2 this is the reaction of the baking soda being baseing out the acid. But for a grow larger than a cab it would be cheaper to just use a co2 injector system.