OMG! What an unimaginably terrible thing to do "Live" rock. In my books LR is much more than just a biological filter..it's a community of life representative of the biosystem of a reef.
I suppose if one has completely killed LR, then what you choose to do with it at that point is meaningless. Put it through the dishwasher, whatever. If you put it back into a tank, it will again function as a bio filter eventually.
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