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CO2 liquid



Has anyone seen this product, currently for sale on ebay, before?
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1290897355
It's apparently a liquid that you dose the aquarium with over a 2 day period and it's good for 2 weeks.  Any idea how this might work?  It's not economical since, for three bottles which are presumably good for 6 weeks, it costs $15 + shipping.

Roxanne Bittman