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Rockwool is a mineral made of a basalt and silica compound. It is used as a grow medium for hydroponic growing because it is cheap, easy to use and can easily retain water.
Learn all about growing with rockwool in this article:
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Grow medium | Soil | Seedling & Cutting soil | Hydroponic | Clay pellets | Coconut fiber | Perlite | Vermiculite | Aeroponic