Can rockwool melt!?

[immortal420]

and no, not by fire

Acidity.

The hydro shop owner said if I have a PH of 5.5 or below, my 4-inch rockwell cubes will start melting and shrinking...constricting my plants...therefore...killing them.

Any truth?

immortal420 Reviewed by immortal420 on 02-19-2009. Can rockwool melt!? and no, not by fire :) Acidity. The hydro shop owner said if I have a PH of 5.5 or below, my 4-inch rockwell cubes will start melting and shrinking...constricting my plants...therefore...killing them. Any truth? Rating: 5