What up Pantera?
Watchin' out for root rot.
I like your idea with the 6". I'm interested in running a similar type setup. Did you end up going with the green sewer pipe? What are the length of your grow chambers? I wanted to use black 6"abs for mine, but it was Wayyy too expensive. I think I'll end up using the green 14' sticks, like Earl used in his setup.
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What size pots are you using in that system? (2" or 3.5")
I can only speak from thorough research on the subject of running your pump. btw, what pump did you end up using for this system?
Cycle timers are an expensive little unit; about 80 bucks, but like smppro mentioned the goal here is to get your roots just enough moisture, the more air the better so its worth the price to be able to fine tune your system. With this timer, not only do you save energy but also allow your plant to "breath" o2 more frequently.
If you can; use the timer....
As far as water collecting in your system just raise one end of your pipe system up by 1/4" per foot of pipe. This will insure proper drainage toward the reservoir. What up with some pictures of your progress?