Most all aero bucket set ups I’ve seen are DTW.
I know the DTW has a 1/4” tap in the lower side of the outside bucket with the inside bucket with lots of hole in the bottom and a mesh to keep the roots out of any possible standing water. Also a 12v pump on timer to evacuate the runoff to waste. I guess you could feed it back to Rez but why bother with influx of contaminates and ph swings... Just dump it and have a fresh feed every spray.
Sorry, can’t help any more than that.