Grodan Granulate 20kg

Grodan Granulate is an ultra-clean, sterile substrate for hydroponic production. Granulate rockwool can be effectively used in recirculating or run-to-waste systems and has a very high water holding capacity. Grodan Granulate is compressed into a 20kg bale, but makes around 140L of growing medium.

• Inert, sterile medium designed for horticulture
• Care should be taken when handling rockwool by wearing gloves and mask
• Suitable for a variety of hydroponic system designs
• Very high water holding capacity (retention)
• Can be mixed with other substrates to achieve desired moisture holding capacity.
• Perfect for large operations.