Speedgrow are natural products made from basalt coagulation (lava solidification) volcanic rocks. The fibers are made by heating this rock, a specialty of the manufacturer. The so-called Ecose technology uses an aldehyde free binder. This sustainable technique is especially ecological.
In this way, the desired structure is developed and offering a product with "healthy" fibers. The big advantage is that roots do not experience resistance to growth and therefore are more resistant to pests and diseases. The plants also get rougher.