Thanks Bonbon for your advice. Nonetheless, I'm still determined to go aeroponics instead of rockwool. Now you must be thinking, "this guy cannot get it right with Rockwool, how can he expect to succed with areo?" The reason is not that I cannot suceed with rockwool, but that I cannot succeed with a handwatering system. I am certain rockwool would not be a problem if I used it properly in an flood or drip system. As you said, the instability cause by handwatering leaves too much to chance. Since I have to invest in a new system anyhow, I might as well go with the best that is out there. So I go aero.