Grodan Rockwool 20Kg

Grodan's granulate rockwool is compressed into a 20kg bale.
It makes up about 140litres of medium.
Rockwool granulate is best suited to run-to-waste systems.
It has a very high water holding capacity which means that it does not need to be watered often.
Rockwool also has a high pH (about 6.5) and must be adjusted to 5.5 for best results.
Grodan Rockwool is an inert, sterile medium specifically designed for the horticultural industry.
Care should be taken when handling rockwool by wearing gloves and a mask.
The rockwool fibres can cause irritation to the skin, and if breathed in they can also irritate the lungs.
see MSDS