Check the link at the bottom for affected batch numbers.
Quote:
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There is a quality concern with KENT Marine Reef Carbon manufactured between December 5th of 2011 and February 8th of 2012. The concern is that the batch of carbon contained unusually high levels of heavy metals which have an adverse effect on stony corals and clams in marine settings. When used in freshwater applications this concern would most likely be unnoticable.
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Central Aquatics Recall Letter
[I know that thread called "does carbon bleach your corals" is stickied, but the Kent recall is easily overlooked because of the name of the thread. Could a mod please sticky this thread for a couple months?]