Part of the roots carpet will be directly in contact with air, the thin water film will provide oxygen dissolved in the water so basically you will not have ‘blind’ spots. An air pump will be necessary in mid flow for roots falling directly in the water at the end of the tray. Beware of hydrogen peroxide, don’t use it.
NFT is not popular between cannabis growers but I would def give it a try, it could really suit your way to grow. Clean work, fast, no pests, big yeld, is it enough?
Really thanks for the suggestion, I really took it into account but I see one big problem. I only grow 4 plants for each 600w. this mean they have to be big enough to fill the space.
Now, using those pots, I can veg. them in a separate vegging room, saving time.
Using rock wool I can't see how they will create a true carpet unless I let 'em vegetate directly in the final tray for some time…time I can't wait to put 'em in flowering.
I also heard RW will be not sold anymore soon, but hey, it's just a rumor.