Master your irrigation strategy with Grodan GT Master Slabs. Featuring dual-layer dual-density stonewool technology, this 1-metre rockwool slab gives indoor growers complete precision over EC, water content, and root distribution.
Specification
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Dimensions: 1000 mm (L) x 150 mm (W) x 75 mm (H) / 1 Metre Slab
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Structure: Dual-layer density (firm upper layer, open porous lower layer)
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Fiber Technology: Hydrophilic, open-structure rockwool/stonewool
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Crop Steering: Wide optimal Water Content (WC) & Electrical Conductivity (EC) range
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Root Penetration: Uniform root development through the entire slab volume
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Lifespan: Single-season / single-crop cycle application
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Compatibility: Compatible with all drip irrigation systems, slabs trays, and rockwool grow blocks (e.g., Grodan Delta / Hugo blocks)
Precision Irrigation & Maximum Yield Control
The Grodan GT Master 1000 x 150 x 75mm Slab is engineered for high-performance hydroponic cultivation where exact water and nutrient control is paramount. Built using Grodan’s advanced stonewool technology, the GT Master allows commercial and hobbyist growers to steer plant growth—switching easily between vegetative expansion and generative flowering stages through targeted irrigation strategy.
Dual-Layer Dual-Density Technology
The unique construction of the GT Master slab features two distinct rockwool layers:
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Firmer Top Layer: Provides optimal water distribution across the top of the slab, ensuring quick root attachment when placing rooted rockwool blocks on top.
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Airy Bottom Layer: Features an open, porous structure that prevents waterlogging, promotes oxygen uptake, and allows drainage water to flow freely.
Effortless EC & Water Steering
Managing root zone salinity (EC) and moisture levels (WC) is effortless with the GT Master. The hydrophilic stonewool fibers allow rapid re-saturation and quick nutrient solution refresh rates. This means you can flush high EC levels rapidly during bloom transitions or dry the slab down for targeted crop steering without creating dry spots.
Uniform Root Zone Development
Because water and nutrients spread evenly throughout the full$1000 \text{ mm} \times 150 \text{ mm} \times 75 \text{ mm}$ volume, roots do not bunch only at the bottom. Instead, they fill the entire slab volume, creating a robust, healthy root architecture capable of supporting massive flower and fruit production.
How to Use Grodan GT Master Slabs
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Wetting Agent / Pre-soak: Before placing your plants, fully saturate the slab with a mild nutrient solution adjusted to pH 5.2 – 5.5 for 24 hours to neutralize the natural pH of raw rockwool.
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Slitting Slits: Cut drainage slits in the bottom outer plastic sleeve at the lowest points toward your drain run-off trays.
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Planting: Cut X-shaped slits into the top plastic sleeve and place your rooted Grodan grow blocks directly onto the top layer.
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Irrigation: Connect drip emitters directly near the base of each block for automated feed cycles.
Frequently Asked Questions
How many plants can I place on a 1-metre Grodan GT Master slab?
Typically, growers place 3 to 4 rooted rockwool blocks (such as 3″ or 4″ Grodan blocks) along a 1000mm slab, depending on plant species, training methods, and vegetative duration.
Can I reuse Grodan GT Master slabs for a second crop?
Grodan GT Master slabs are designed as a single-season product. Using fresh slabs for each crop cycle ensures zero pathogen carryover, clean structural integrity, and maximum irrigation consistency.
Why is rockwool better than soil or coir for drip irrigation?
Rockwool is an inert medium that holds an optimal balance of water and air (up to 85% water and 15% air space when fully saturated). It allows complete, instant control over plant nutrition with zero chemical buffer interference.
Why Buy Hydroponic Supplies from Hydro Land?
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Direct Hydroponic Procurement: Genuine Grodan rockwool products sourced directly from trusted manufacturers.
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Fast, Discreet Shipping: Plain packaging delivered straight to your home or grow facility across the UK.
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Expert Technical Advice: Real guidance from experienced growers who understand nutrient scheduling and environmental control.
