Growool Premium Floc 13.6kg is loose Rockwool mostly used for filling pots and containers for growing.
 
Also known as granulated Rockwool but we feel granules is a bit misleading. Floc is more small bits of fluffy rockwool than granules.
 
Bags are compressed so they take up less space than when you use them. 1 bag should be around 110-150litres when fluffed up.
 
Over fluffing will mean the floc will collapse a bit when watered.