Grodan W.A. Medium Stone Wool Granulate – 20 kg

Grodan W.A. Medium is a professional water-absorbing stone wool granulate with a fibre length of 6 to 12.5 mm. This versatile loose-fill growing medium can be used as a standalone substrate or blended with other growing media, including mixtures containing organic components.

Thanks to its water-absorbing properties and good capillary action, Grodan W.A. Medium supports uniform water distribution throughout the substrate. When added to organic growing media, the granulate can improve water retention while contributing to a more aerated root environment.

Its stable fibre structure helps the granulate maintain its properties over time. This makes Grodan W.A. Medium suitable for a variety of cultivation systems where reliable water availability and root-zone aeration are essential.

Benefits

• Excellent water absorption and capillary action
• Medium fibre length of 6 to 12.5 mm
• Improves water retention in substrate mixtures
• Supports an aerated root environment
• Stable, fibrous structure
• Suitable as a standalone growing medium
• Can be blended with organic substrates
• Versatile use across different growing systems

Product Specifications

• Brand: Grodan
• Type: Granulate W.A. Medium
• Manufacturer article number: 14555
• Material: Stone wool
• Fibre length: 6 - 12.5 mm
• Weight: 20 kg
• Packaging volume: 140 litres
• Minimum ready-to-use volume: 180 litres
• Property: Water absorbing
• Sales unit: 1 bag