• 888-815-9763 Sales & Support Mon - Fri, 8am - 5pm PST. Instagram Facebook Twitter Google + Youtube



Save Now on Top Brands Like Twister, CenturionPro and Trimpro... Up To $600 off! Shop Now


Grodan Classic Slab, 12"x3"x36", Case of 8

Item #: 713015

Be the first to review this product

Your Price:

In Stock

In stock items ship within 24 hours

100% Discreet Shipping Price Match Guarantee The HB Difference

Warranties | Returns & Replacements

Grodan Classic Slab, 12"x3"x36", Case of 8

Additional Images


Product Documents

Grodan Rock Wool MSDS

Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth. Grodan comes in graduated sizes. Seedlings started in cubes are easily transferred to blocks and then onto slabs, if desired. Seedlings or cuttings started in the Grodan cubes can also be transplanted into more traditional planters and growing mediums.

Grodan Slabs -The final stage of planting with growing blocks are the Grodan slabs. These slabs come in clearly marked UV resistant poly sleeves for ease of use. Recommended for larger, long term crops with extensive roots like peppers, tomatoes, or cucumbers. Typically, seedlings in blocks are placed onto slabs. Grodan Expert is the slab that drains the fastest because of its vertical fibers. By far the most popular slab for the hydroponic hobbyist market. Grodan Master is a special wet/dry slab. The top layer is thicker, which stays wetter, while the bottom layer stays drier. In effect it defies gravity, allowing more even distribution of moisture throughout the slab.

Most plants can grow in Gro-Slabs but they are particularly good for growing large vine crops such as tomatoes or cucumbers. For plants growing outdoors during mid-day sun Gro-Slabs provide a good water buffer.


Brand Grodan
SKU 713015
Weight (lb.) 17
Length (in.) 35.3
Width (in.) 18
Height (in.) 12
Free Shipping No
Grow Media Rockwool

Grodan Classic Slab, 12"x3"x36", Case of 8 Videos

Shipping Info:

Ships Via FedEx/UPS

Questions about this product?
Contact us for advice or more details. Our product specialists are here to help.
Email an Expert
Report an issue on this page

Why Shop with Hydrobuilder?
We offer the best service and support in the industry. Your complete satisfaction is our goal.