I didn't have a problem with rockwool, but I only used 1x1", after I germ'd, and in conjunction with DWC...never in blocks or slabs. I can see where there would be alot more problems with it in those applications
now, through research and hanging around these forums...I don't use it except, as a starter after I germinate. It's just that it worked for me, so far...just my $.02 worth.
...later
latewood Reviewed by latewood on . Lava rock Hydro I'm looking for somebody that grows in just lava rock. I run a drip system with lava rock and have a few questions. Rating: 5