The water is sprayed from a small tube that runs along the upper corner of the rails, there is no individual feed to each plant site, which is why I call it a NFT/aeroponic unit. That's the only reason I was wondering about using it as an ebb & flow, as it will fill the rails if you set it up this way.
The unit is at http://www.genhydro.com/genhydro_US/aeroflo2.html .
Thanks.