I think this should be an absolute last resort to get something useful from rock which has become overrun with algae and otherwise useless ....because when you are done you have biological filtration rock...not live rock anymore (sorry, my opinion only)
For me...good live rock should be treated with as much respect for the life on it as you might with a new fish. Goodness knows it costs enough! LR is (by a factor of 10) the most expensive live thing that I've put in my tank.
I do respect that everybody wants something different from their tank. Me..I expect a lot more from my live rock.
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