Quote Originally Posted by SpaceNeedle
The constant water will prevent oxygen from reaching the plant.
Dude, you're still not getting it. In a DWC system, the oxygen is IN THE WATER. The water carries the oxygen to the plants. That's why you use the air stones, to create a high level of dissolved oxygen IN the water. Root contact with the air is completely unnecessary in a DWC environment. The entire root system of the plant can be completely submerged throughout the entire grow with no ill effects as long as you're pumping enough air into your reservoir.