Hey I got a question, anyone tried NBG's layered medium setup? Personally I think that is what I am going for next time. I am on DWC right now, but somehow that layer medium seems to be a lot easier.
I'm also curious about this, as I haven't seen a similar technique in other grows... and I haven't seen many grows as productive as this one.
Maybe you could replace the rockwool with coco coir.
I think the air porosity for some coco coir products is slightly higher than shown on this chart, but if it's similar to rockwool in both properties than why not? The point of the rockwool in NBG's mix was to hold water, correct?