I use airlift to move water in our RAS, it is easy to do and takes less energy.
On a large scale water pumping system where you need to introduce O2, I would still suggest having the water enter the pond through a sprinklered end of the piping. A sprinkler introduces the water to the air after pumping which allows you to move more water and then allows more O2 to be introduced after leaving the nozzle. Its a win win.
PS. I like Rob's work. Been watching his videos for a while.
