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GFO – Large Granular Ferric Oxide 8lbs $50

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Hello.  The large granular GFO is often used in commercial fish farm applications.  It is either necessary to change the GFO more regularly or pulverize it so it will tumble in a reactor, which is what I did. I would take a cup, or so, put it in the sandwich bag and crush it with a meat tenderizer.  The process is pretty quick.


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