My beer has metallic taste - is that from the metal?

No - this is most likely from your yeast. (Assuming of course you have properly cleaned your unit per our instructions using TSP, Starsan, etc.)

Some metallic tastes are possible during stages of the fermentation, there's a lot of chemistry happening. There are also possibilities of the yeast itself creating the metallic taste.

Yeast which is under stress or not healthy to start with will create a metallic taste that remains with the beer . . . it's part of the yeast expelling minerals as part of it's natural defense. . . . you can read about this in Chris White's Yeast book. . . Just google that for more detail.

So a place to look is at the yeast - was this the first time using that type of yeast? - was it harvested from a prior batch? - was it old, near it's expiration? - was it stored well, both at the store and after you purchased it? - was the pitch temperature correct? - did the temps swing up/down during fermentation? - did the wort have proper PH? - did the wort have proper O2? - did the wort have proper mineral balances? - it just keeps going.

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