rockwool in tubs

[Zandor]

if you are using rockwool cubes .3.5,s i think their the size of a rubics cube s

if you put them in say a cut 2 litre milk carton ,can you put a 1/3 inch of water at bottom all time ,ie keep topping it up or is this to much water for the roots to sit in etc
andy

Yup what loc say's is about right. Why not build a DWC setup? Or pick up a real hydro system?