Air Pump Question

I'm about to try my luck with a DWC grow. I'm planning on having 2 5 gal buckets, but after a lot of reading I'm still not sure if the air pump I bought will be enough. The air pump is a EcoPlus Air Pump 4 9 liters per minute Eco Air 4 - Four Outlets - 12 watts (with variable control) Will this be enough to run both buckets? I plan on having 2 air stones per bucket. Thanks in advance, the link to the air pump is here http://www.hydroponics.net/i/132912

I use something very similar i got at walmart or petsmart and i use it for 4 5gal buckets with no problems.

Thanks for the reply, was a bit worried. I read somewhere that I needed 30l /min per plant, which sounded a little overkill for me, thought I would have to buy a commercial one for a closet setup, lol.

use the smallest air stones you can for best results and dont drop em they break well easy!!