Quick question. Do I put the rockwool with the seedling at the bottom of the net pot and pile the hydroton above and around or do I put a layer of hydroton on the bottom of the net pot and then place the rockwool seedling on top of that and then surround it with more hydroton?
I fill the net pot with hydroton and put my rockwool down inside, flush with the hydroton at the top.
I replaced hydroton with polished ornamental rocks from Dollar Store Clean, easy to remove from roots and reuse endlessly
Be sure to soak the rockwool and the hydroton in pH water for a day, do not squeeze the cubes, just let drain.
I use clay balls in my hydro systems but never rockwool, that stuff is really hard to get perfect. Expanded clay balls (hydroton and other brands) is a great medium for roots