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Originally Posted by reef_raf
. Old sand has PO4 leached into it's surface pores and only acid will remove it. .
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SO if only Acid will remove it then it woulden't be a problem in the tank as we don't keep are tanks acidic. PO4 is natural bound to the Calcium carbonate and can be liberated by bacteria and other means. I will try dig up that article on the PO4 cycle it is good reading.
Steve
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