Im new to home growing but due to the crap whats on sale locally im gonna dive it a try, im gonna use a 80 x 80 x 180 growtent in a closet im just wondering the best way to produce co2 for my plants?
a 20# tank and regulator, The cost is higher up front, like 300 bucks, but you will have a electronic regulator that can be run on a timer or a brain. The refills will only be about 14 dollars. Sorry for the US prices but it is all I know. you could look for used tank and regulator...Good luck JR
Most hydro stores carry co2 tanks brand new but you can just go to a welding shop and they usually have used tanks they can sell you. They can even fill it up with co2 as well. You will still need to get a regulator but it's a little cheaper than buying everything new.