Grodan Improved Gro-Slab | 6in - 36in x 6in x 3in - (3) 10in x 10in Pre-Cut Holes

Precut Rockwool Slab with Hydrophilic Technology, 36x6x3in

Uneven water distribution across a rockwool slab can leave some root zones underserved while others stay saturated. Grodan Improved Gro-Slab is built with improved hydrophilic technology so water and nutrient solution move more uniformly through the slab, supporting steadier root development.

36in x 6in x 3in slab, 3 precut 10in x 10in holes, individually bagged.

Key Features & Benefits

• 36in x 6in x 3in slab with 3 precut 10in x 10in holes — ready-to-plant sizing without cutting holes on site.
• Improved hydrophilic technology — supports more uniform water distribution throughout the slab.
• Individually bagged — keeps each slab protected and sterile until it's opened for use.
• Precut holes positioned for easy planting — reduces setup time when transplanting into the slab.

Who Should Use Grodan Improved Gro-Slab (36x6x3in)

This fits hydroponic and drip-irrigated growers running standard rockwool-block transplant setups who want a precut, individually bagged slab with more even water distribution.

About Grodan Improved Gro-Slab

Improved Gro-Slab is manufactured using Grodan's stonewool process, in which molten rock is spun into fibers and compressed into a consistent, sterile growing medium, a method the brand applies across its full propagation and slab lineup.

Frequently Asked Questions

How does hydrophilic technology improve this slab?

Grodan's improved hydrophilic technology helps water and nutrient solution distribute more uniformly throughout the slab rather than pooling or channeling unevenly. That more even distribution supports steadier root development across the whole slab, not just near the drip point.

How many holes does this slab have and what size?

It comes with three precut 10in x 10in holes across a 36in x 6in x 3in slab, spaced for standard transplant blocks. The precut sizing means growers don't need to cut holes on site before planting.

Why does individual bagging matter for a rockwool slab?

Each slab ships individually bagged, which keeps it protected and sterile until it's opened for setup. That's a packaging detail that matters for growers running clean, contamination-sensitive systems.

What size growing setup is this slab suited for?

At 36in x 6in x 3in with three precut holes, this Gro-Slab is sized for standard rockwool-block transplant setups in a hydroponic or drip-irrigated system. Larger crops or wider spacing needs would call for a different Grodan slab size.