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I've seen some plans for that vertical tube, and it's done either with misting spray emitters inside, or some with drip feeders on the outside.
Personally, I like to see things working.
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It would seem to me much easier (and better) designed as a areoponics with the misters/emitters inside the tube. As for me I would have a single P.V.C. pipe straight down the center with the misters/emitters screwed into it. That way if there ever was a problem with the misters/emitters all I need to do is pull the emitter tube out of the top and replace it with a fresh one, making maintenance easy. Then have a return line at the bottom back to the reservoir. Also I would have many more ports for the plants taking advantage of all the open space, and using a 8 or 10 inch tube.
I also would love to see it in action, but I live in AZ and the pictures were taken in Florida at Epcot Center (I believe). I have a file of hundreds of hydroponic images I saved, but don't have much information on them. I save them because they give me inspiration and ideas on different system setups. I have seen many images at Epcot Center and I am sure that is where these were taken even though there was no caption to the pictures.
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As for the trough...I think what makes it 'ponics is that it uses a soiless substrate and there is constant movement of nutrients from one end to the other, back into nutrient tank.
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Yes, Growing without soil is the definition of hydroponics. I just am not sure if the picture is actually a
hydroponic system because I cant tell what's in the troughs, and if it's soil or not from the picture. There is a line near the back, like for a
drip system. But that doesn't mean they don't just have soil in it and using a water drip irrigation system to water it. Again the images didn't come with captions.
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I've also though about setting up a trough grow, but I want my trough elevated at the top of a trellis and have the plants grow across a horizontal trellis and down one side (sun facing side). Then have my lettuce setup underneath all that to provide shade and cooling for the hot months.
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That's actually a good idea I hadn't thought of. It also would be a space saver.