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http://www.grodan.nl/oplossingen/groenteteelt+producten/grotop+master http://www.grodan.nl/oplossingen/groenteteelt+producten/grot... Used in Dutch greenhouses

• jsilence 10y ago
  Most of the grodan producs are made from rock wool. From a plant perspective it is a very good substrate, good capilarity, inert, stable. But it is not compostable and recyclable. For a classical ebb and flow grow bed, the rock wool fibers are too fine grained.
  • spiderfarmer 10y ago
    You're wrong, it is 100% recyclable[1]. Otherwise we would have an enormous heap of those things. It's not composted, but luckily these things can be recycled into other, more useful products. You basically can't sell compost over here as there is too much compost already. We're already exporting compost to the UK for very low prices. [1] https://www.youtube.com/watch?v=f5yw_RIU59o https://www.youtube.com/watch?v=f5yw_RIU59o
    • jsilence 10y ago
      Ah cool, good to know. Thank you for the pointer.