Well in the first DVD he says a few times "The aquamist system is one of the best systems" "Aquamist systems are the most maint. free systems out there" and he mentioned the one didn't get flushed while the other 2 only got flushed like once because of the aquamist system being how it is. They are not much just spend your income tax refund on one
(if you live in the US that is lol)
Edit: theres one cool dude on here that builds them, i'll see if I can find the link. They are not the full size systems and dont use the same sprinkler heads as the ones in the first vid but they are impressive. They get the job done thats for sure.
Edit Edit:
https://www.rollitup.org/hydroponics-aeroponics/22362-30-minute-6-plant-aero-10.html
It dont look like its too hard to build.