Lettuce raft?

[GreenFarmer]

I know that it is basically a tomato site, i am making a lettuce raft that i want to oxygenate using a water pump. i had success using air pumps in the past but i am trying to find out what big farms use and how they inject the O2 using only water pumps. i have ideas to make a small gallon above the raft with a hose that goes into the raft and i can oxygenate the water in that small res and inject it into the raft. however i wonder if that would be enough. i really would love to know how they the pros do it before i go through trials and errors on my own. any knowledge on this is greatly appreciated