I'd rather use a DIY or Tank system.. Cuz once the bubbles rise from this thing, there's no way to recapture them and put them through a diffuser or a reactor which is a great waste of co2.
Although I'll admit it's a tad more troublesome to do the DIY Generator.
One guy is selling it here:
http://auctions.yahoo.com/questions/...&aID=111228404
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