I was thinking on investing in one of this co2 bags. with exhausting my Room, will out just suck it all out? I know this Has probably been answered, but my question is if i have it close enough to my plants will it do the trick? The guy at the hydro strore said that as long as i have it a few feet below my exhaust the co2 will fall to the floor because it is heavy.. Is this true, or should co2 only be used in sealed systems?
Those bags probably won't help your plants at all. They produce a rather small amount of CO2 for your plants to use. Don't waste your time. CO2 can get mixed up with lighter gasses and pulled out.