I'm not sure why a "hydro" system goes to such lengths to keep roots out of the water.

This is the horticultural equivalent of strapping a fat lady into a chair, just out of reach of an all-you-can-eat buffet. :wtf:

Why don't you try it out yourself, and let us know how it works. I'll bet if you lose the screen, pump, and timer, and throw a bubbling airstone in your res you'll do much better. :thumbsup: