Grodan Classic Slab

These slabs are specifically engineered for large, long-term hydroponic crops. They provide the structural support and root environment necessary for heavy-feeding plants like tomatoes, peppers, and cucumbers.

The dense, spun-fiber structure is designed to hold a high volume of nutrient solution while maintaining enough air pockets to ensure roots receive consistent oxygen. This balance is critical for preventing root rot while promoting rapid, healthy growth.

Yes, the slabs come pre-packaged in UV-resistant poly sleeves, making them ready for immediate placement in your hydroponic system. Because the material is sterilized, you can transplant your established cubes or blocks directly into the slabs without worrying about weeds or pathogens.

The Expert slab is designed for faster drainage, which is useful for growers who prefer more frequent irrigation cycles. The Master slab is optimized for a more balanced wet-to-dry distribution, providing more consistent moisture retention throughout the growing cycle.

Grodan slabs are sterile and ready for use, but it is standard practice to stabilize the pH of the rockwool before transplanting. Ensure you soak the slabs in a pH-adjusted nutrient solution to prepare the medium for your specific crop requirements.