What are the different types of hydroponic media?
Rockwool Rockwool for hoticultural use was invented in Denmark by Grodan in 1969. The product is today used extensively world wide. In North America the majority of greenhouse vegetables are grown in Grodan. Stonewool absorbs moisture without holding nutrients, and even when it is completely saturated still retains 20% air for your plants root system. Stonewool products are made from basalt rocks and chalk, which come from the Earth. Mimicking Mother Nature’s production of “angel hair” during volcanic activity, the Grodan stonewool manufacturer heats rocks to 1600C, to create lava. The lava is blown into a spinning chamber, which makes fibers similar to cotton candy. The fibers are packed into mats, from which Grodan cubes, blocks and slabs are cut. Small tufts of fibers are also produced and bagged as “rockwool granulate”. The products make excellent use of natural resources: one cubic yard of rock becomes 37 cubic feet of wool!
