What GanjaRobPDX said.. you're using a NFT interval timer, right? You may want to look up the stuff done by StinkBuddies, a fairly simple way of doing Aero/NFT and would provide plenty of good info. His system also made High Times about 3 years ago now.

Peace,

Farmer Rich
Farmer Rich Reviewed by Farmer Rich on . Aero-grow question Once the roots are well developed and dip down into the nutrient solution do I still need to run the water pump and spray them, or can they pull up nutrients all by themselves? Rating: 5