Its possible to do that with alot of work C.P.
I gotta think that it might be a little wasted effort though.
Soil in containers, with a plant in it (especially one that is having gallons of water dumped through it) is gonna deplete itself of its available nutrients and chemicals pretty fast anyhow.
If your pouring tons of clean H2O through there along with the plant itself feeding of what little is still in there, i dont see the need.
Your gonna leach most of those chems out anyway.
