Everyone knows that Zandor hates Rockwool...by the way I am using lava rock in a grow this time around...thanks for the cleaning tips...I was just gonna clean them like I do my hydroton...soak them in a light bleach solution, but I like the cement mixer thing and I have one. Acouple of people use them under their grow medium, goodluck, bender.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