I hear you can grow underwater plants and feed baking powder for co2

Imagine breathing oxygen rich water? or super super humid air
Sparrow Reviewed by Sparrow on . hows this Co2 system? http://cgi.ebay.com/HAGEN-NUTRAFIN-CO2-KIT-FOR-LIVE-AQUATIC-PLANT-GROWTH_W0QQitemZ7755429749QQcategoryZ66794QQrdZ1QQcmdZViewItem 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 Rating: 5