steel co2 tank 5lb
full  = 14.16
empty = 8.62
empty w/reg = 10.78



http://www.beerdude.com/howto_brew_allgrain.shtml
http://howtobrew.com/section4/chapter19-3.html
http://www.ehow.com/how_2145326_make-stout-home-brew.html
http://www.wikihow.com/Brew-Beer-Using-All-Grain-Method