Grodan Classic Slab
Best hydroponic slab for growing large, long-term vegetable crops.
These rockwool slabs are the gold standard for heavy-duty hydroponic crops like tomatoes and peppers. You trade the organic feel of soil for sterile, high-performance precision that guarantees rapid root development and consistent nutrient delivery throughout the entire growing season.
$117.07
at
Simply Hydroponics (SimplyHydro)
Who it's for
- Precision growers seeking a sterile, pathogen-free environment
- Commercial growers needing rapid, efficient transplanting workflows
- Hydroponic gardeners prioritizing consistent, healthy root development
Who should skip it
- Gardeners sensitive to skin or respiratory irritants
- Eco-conscious growers prioritizing sustainable, biodegradable materials
- Budget-focused hobbyists looking for low-cost growing media
Performance breakdown
Root Oxygenation
Advanced fiber structure ensures roots receive consistent oxygen for rapid development.
Water Retention
High-capacity absorption keeps nutrient solutions available during peak growth cycles.
Transplant Efficiency
Seamlessly integrates with standard blocks to minimize plant stress during transition.
Sterility Standards
Completely weed-free and sterilized for a clean, pathogen-resistant growing environment.
Structural Durability
UV-resistant sleeves protect the medium throughout long-term, heavy-crop production.
Nutrient Control
Inert composition allows for precise, grower-defined nutrient delivery without interference.
Key Specs
Material
Rockwool (molten rock fibers)
Format
Slab
Dimensions
12" x 3"
Weight
91 lbs (Case of 8)
Packaging
Case of 8 slabs
Slab Types
Expert (fastest drainage) and Master (wet/dry distribution)
Intended Use
Vegetables
Moisture Retention Level
High
Drainage Level
Fast Draining, Moderate Draining
Aeration Level
High
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