The overlapping/agitation of the water on the surface is what gives your nutrients the added oxygen level... Air stones wont give you this kind of turbulence, or oxygen..

Air stones are helpful for fish in an aquarium, but not for extreme root growth...
BUCKETKING Reviewed by BUCKETKING on . air stones whats a good site to buy cheap air stones and other hydroplonic equipment. I was tipped off to one with circle air stones but bought a new computer so lost the site any help would be appreciated Rating: 5