I would second the idea of installing net pots

also consider installing spray emitters in between each grow hole, and do a aeroponic setup in your pipes.

NFT in pipes didn't work well for me, the plants at the feed end grew a lot better than the ones at the drain end.

I eventually threw away the pipe system,not enough root room.
Daddynobucks Reviewed by Daddynobucks on . SOS HELP WITH EVERYTHING There are two parts to this grow.:) I have an ebb and flow system I think. The size of the room is 12 x 20 and i am using 4 inch pvc pipe with holes every 8 inches for a total of 16 plants per pipe. Pipe is 10 feet long I have a reservoir at one end with Air Stones and a small pump, and a 6 inch Pipe that sits on top of the 4 inch pipes and stores water until needed and drains into pipe as required. I am using GH Flora Grow at 700 on Dip Stick. I have white plastic Mylar on Walls, Floor Rating: 5