GrowFAQ:

Can I use industrial grade rockwool for my hydroponic medium?

  Added by: MedMan  Last edited by: MedMan  Viewed: 297 times   Rated by 6 users: 5.83/10
Most industrial insulation contains a fire retardant chemical that severly restricts growth and will cripple your plants.


The only option is horticutural grade, grodan and oasis for example.
  Last modified: 21:48 - May 30, 2001  


faq:986 "Can I use industrial grade rockwool for my hydroponic medium?"