Which media blaster?
http://sfbay.craigslist.org/nby/tls/3735099207.html
Harbor Freight, Red, 40lbs nominal, better water trap, fittings
http://sfbay.craigslist.org/pen/tls/3732127272.html
Soda blaster 15lb capacity, comes with 1/2 bag of medium soda material...