The light hangers are cool but they gave me hell the other day
LOL
We thought of using a screen of some sort but a lot of issues might happen with that, the screen could clog, the roots could push through it, I have no idea if it would work they way you would want. Nylon stocking mesh is very fine and water might not easily pass through it, but I'm willing to try different things. Always having roots in nutrient solution hasn't been bad for my plants- they are growing like mad. Maybe just an airstone going in each of the buckets would help, but I'm not sure how much. My plants grew so fast I couldn't imagine it any faster, but I know it could be improved. A screen plus airstones would be so awesome!
Let me know how it turns out though, it would be really cool if the screen worked the way you want!