I have made one and it is doing great after I made mods for my setup. Here is the first thread it was on.
DIY Aeroponics made easy! (and <$40)

I am starting today running the pump 24-7 now that this new thread answered the questions I had from the other thread.. I am having rooting problems with this last crop of clones. I am using a cheap timer so I will running the pump for 15min on and then 15min off. Have you tryed running it this way Lurk? Also have you had leaks from around the lid? Thanks

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