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Grodan Rockwool is made from basalt from the depths of the earth. The rock slurry is super heated, spun like cotton candy and then cut into shapes. Grodan Rockwool is one of the best in the world, made in Denmark since 1969 Grodan Rockwool (Stonewool) comes in many different shapes and sizes. Grodan stonewool (rockwool) is known for its quality, consistency and performance. You can count on the performance of Grodan as growers have used it for decades! The use of Grodan stone wool substrate offers many advantages for today's hydroponic grower. Because of the manufacturing process this growth medium is consistently high quality. The production under extreme temperature ensures that the product is clean and sterile. Its unique hydrophilic fiber also makes the cultivation on stone wool substrate very easy to control. Administering the amount of water and nutrients your plants efficiently keeps yields high, and energy consumption low. Rockwool (Stonewool) is lightweight, making it easy to use. Rock wool can be easily re-used providing a sustainable and environmentally-friendly grow medium for your hydroponic system.