Quote Originally Posted by bud luv
I had this same dilemma a few days ago.

Your roots will undoubtedly get much longer and if you dont do anything they'll be exposed and susceptible. Some people don't have a problem with this, but I didn't like the idea. Coco Matting is an option: http://boards.cannabis.com/showthread.php?t=96478.

rockwool would hold too much water, i've seen other people use hydroton for your problem though. what's in your netpots?
if your roots never grew through the new pots your using (its inherent they will grow through...as they are net pots and thats their design) then youd have pee sized plants that barely produce a thing. Modify your system so the roots are in the dark. Roots are supposed to grow out of the netpots, regardless of your hydroponic system.