Bubbleponics Help Needed

I need to know what type of air pump for a diy bubbleponics setup. I have 4 12'' airstones. I bought an airpump good for 150 gal tank and it wasnt impressive. I was directed to this website but i dont understand that the pump is rated at 600 Gal. but no info on the pressure or cfm is given.

http://www.discount-hydro.com/productdisp.php?pid=412&navid=8

That is a great pump, it is 600 gallons per hour. Google for a conversion to cfm. It will power 4 12 in airstones in a diy tote very well, that's what I use. And (per the link below) with that kind of bubble action, you have no need for a submersible pump and feeder tubes.