Skeetagator on Youtube
This is the love child of two other instructables. The Even Simpler Flood and Drain System - The Mosquito and the Modular Hydroponics - Low Profile Reservoir. Using Gatorade bottles and soft tubing to form a pressure seal, I was finally able to get air and water tight seals between the planters and the drain pipe, sooooooo ....
The unit that I built here is only 19" long, but it should be able to be implemented on a much larger scale easily. As the pipe increases in length, the required volume of air will increase, but not the required pressure. Redundant, individual air pumps would provide the required air, keeping the fill cycle reasonably short, while also providing security against pump failure.
Please also excuse the photos. This was built and tested, rebuilt and tested, rebuilt .........., so the photos describing the steps are of a disassembled, finished unit. My apologies, but it does show how each planter and the reservoir are still separate "modules?", however loosely.
Step 1: What You Need
2 ea 2L Pop Bottles w/caps(NOT Pepsi)
Gatorade bottles w/caps as req'd
7/16" OD clear Vinyl tubing as req'd (4.75 inches per Gatorade bottle)
1/4" Aquarium air tube as required
1 ea small, self tapping screw
1/2" Drill bit
1/16" Drill bit
13/64" Drill bit
Hot melt glue gun w/glue
Long pry bar thin enough to fit though the neck of a 2L bottle