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Can you use starsan more than once I was told no. I mixed up 4ml to just over 2lts and left it in the fermenter fridge at 9c or should I leave it in my beer fridge never used it before. I just use it when I need it in a spray bottle only and let it dry no wash after.

I believe you can re-use starsan so long as there is not too much organic matter in the solution, and the pH is still below whatever it is supposed to be.

I don't think you can re-use Iodophor once it is mixed, always goes clear on me pretty quick.

Thank's