Quote Originally Posted by junkboxer
http://cgi.ebay.com/HAGEN-NUTRAFIN-C...QQcmdZViewItem

i was looking for soemthing to buy thats on ebay and can produce co2 for our plants. this is all i really found. does any1 know what this is or if its good? thnx
This setup looks useless for what you have in mind. It's not gonna generate enough volume over time to be economically feasable. A 20-gallon aquarium tank is just a few cubic feet. How big is your grow space? The water catches and holds the co2 in ways the atmosphere can't. How are you gonna control it?

And to argue their marketing hype -- a pressurized tank is the least "inconvenient" and most controllable of any co2 enrichment method. I've tried the pellets, the soda and vinegar, and the fermentation. The only thing I see these solutions as good for is masking the plant odor with a whole different level of stench.