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#1
12-25-2013, 05:20 AM
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As long as it stays dry and sealed there should not be an expiry date. IMO it needs to have water cycled through it to activate just like carbon does.
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Feed the bear goodies, make a new friend, don't feed the bear............... 8' - 165gal Reef DIY LED's Build 2012 Nano Contest Winner Febuary 2013 POTM Winner 300 gal + 60 gal Complete DIY Build 
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#2
12-25-2013, 11:22 PM
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I just used some Barrier Reef GFO media in my tank last month. Its at least 3 years old. It worked well but my phosphates levels creeped back up in about a month. I think the increase is due to the high volume of phosphates in my tank and use of minimal amount of media in a tank with very high levels of phosphates.
So, IMO, it does not have a shelf life as long as it stays dry.
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