Rockwool is made from rock that is heated to 1650°C and spun into long fibers (wool). Benefits: 1. Lightweight, pathogen-free, disease-free, seed-free 2. Even, rapid water distribution throughout the media 3. Inert - will not add or hold back any nutrients or water from the plant 4. Usable in recirculating systems from first drain, reducing water and fertiliser usage 5. Excellent buffer and re-saturation capability Dimensions of each block: 25mm x 25mm x 40mm (H) How to Use? 1. Soak or spray rockwool with nutrient solutions (1.5uS/cm, pH5.5-6.5) till fully saturated 2. Put 1-2 seeds in each rockwool 3. Ensure seed propagation blocks are moist throughout growing period Product of EU