Basically you're putting the rock in the dark with water and a heater to kill off the algae, then doing water changes to export any excess nutrients that are shed by both the dying algae and that may be leaching out of the rock. A lot of people do this for 6-8 months or longer, I've done it for 3-4 months with success in killing the algae but have never tested to see if phosphates are leaching from the rock.
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Christy's Reef Blog
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