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This system Luches bilt probably won't work
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I also had concerns about the lack of screens, and just using gravel as a
growing medium for the same reasons. I also was concerned with leaking where the inlet and outlet tubes go through the growing containers. It's my experience no mater how tight you make the holes they will leak if not sealed. I hadn't mentioned these for two reasons. One, well you have read enough of Luchas's threads to know what would happen if I did. Also, I would fix these problems before I grow if I used a similar design. I have my suspicions about
nutrients also, I haven't looked it up but I would guess that corn is a heavy feeder, especially when the corn cobs are growing.