I've only bought one bag of Irish Moss in at least 2 years. It's so cheap but is there really any need to replace it?
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2 Answers
Irish moss is a dried, dead product (seaweed), which if kept in a air-tight jar out of sunlight will last pretty much indefinitely. I'm using mine that I bought 4 years ago and the wort still clears nicely.
Some other anecdotal evidence, david_42, senior member on HBT writes
Well, I'm about half way though a 4 oz bag after 6 years. Seems to be doing the job still.
So I think you're fine with 2 year old moss.
I have some that is about 16 years old. I added it to a test sample of mead (the dregs that were left over after moving the must to a secondary fermenter). It clarified well and does not appear to affect the taste. I don't know how it will change with t
