Sanitizing and K-meta Contact Time

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Why add the citric acid? I don’t understand the purpose
Acid lowers the pH and makes the SO2 more effective. My current K-meta solution recipe is 2 to 3 Tbsp K-meta and 1 Tbsp acid. Tartaric is supposed to be best, but any wine acid that lowers the pH works. I have a large bag of acid blend, so I'm using that up.

EDIT: Craig's post didn't appear before I posted, hence us saying the same thing.
 

gmac52

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Acid lowers the pH and makes the SO2 more effective. My current K-meta solution recipe is 2 to 3 Tbsp K-meta and 1 Tbsp acid. Tartaric is supposed to be best, but any wine acid that lowers the pH works. I have a large bag of acid blend, so I'm using that up.

EDIT: Craig's post didn't appear before I posted, hence us saying the same thing.
Thanks
 

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