The raw stone material is superheated to almost 3,000 degrees Fahrenheit. The molten rock is injected with air and spun into a fibrous, a process often compared to cotton candy being made at a fair.. The material is then treated with a hydrophilic binder to facilitate liquid absorption, which ensures even distribution of water and nutrients upon use.
The stone wool is then cut into various sizes and shapes—from starter plugs to larger Gro-blocks and slabs - each specifically designed for different stages of crop production. Finally, the finished products are wrapped in a special film that blocks UV light and limits the growth of algae on the substrate surface.
