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Originally Posted by BEEFCAK3
very good points al. the only way i could get the medium ur using is to order it and i know you cant reuse that stuff this would be the first for me to see that kinda of medium..
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Well, use soil with proper fertilisers or inert media with hydroponic nutes, one or the other. Check your local building supply for rockwool insulation, which if it is the absorbent type of rockwool (as opposed to water repellent type) will work just fine.
There would be a glass fibre inhalation hazard with dry bulk fibreglas, but it would work OK as a medium if you keep it damp to prevent a lot of glass fibres from floating around.