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Originally Posted by DierWolf
plus 5 litres (just over a pound) of co2 wount last you but a one time treatment, seeing that the plants use it up very very quickly and to get the PPM you need will require more than that, unless your growing in a 2ft x 2ft x 2ft box.
Your best bet is to go where there sell paintball equipment and buy a 20 pound or 50 pound Co2 Tank and use that...
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Yeah, you could also get a scuba tank (not sure if that's what you're talking about) and then get it filled at some place where they fill Co2, they're there but you may have to search a bit for it. This might be inefficient because I'd imagine you'd use up the Co2 pretty quickly and it's most likely a pretty penny to refill the tanks, but I might be completely wrong.