I make a simlar system, and I call it my "tree machines"
And I think DD's system is over complicated, no need to raise your containers, no need for air pumps..
with a good understanding of DO anyone can make such a system... with many different designs.. they all work the same, roots in DO rich recirculating water!!!
So what exactly has DD sold, LOL. does this mean undercurrent are now having to pay dd royalties because he has a patent on this method of feeding plants???
heath robinson just had a 76oz plant with no air stones, no chillers, no AirCon, no 1000watters, no raised containers, No massive nutrient bills, no flush at the end,
etc etc.
happy growing all
peace
BL