As I said in my last post, fluorite is crushed pumice. It is inert, and has not nutrients in it. That tag line is about it's higher CEC rating. The reason it gets a high CEC rating is due to the granule size being bigger than something like play sand. The CEC rating is more for fertilizing via the water column, i.e. Adding liquid or powdered ferts. It allows the exchange of those nutrients through the substrate, into the roots. For root feeders, the CEC rating isn't as important due to the roots being inside the nutrient rich media. If that makes any sense.


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