Campden Tablets (Potassium Metabisulfite) - 25 count

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In wine, used to kill naturally occurring microorganisms and prevent spoilage. Also works as an antioxidant. Add at a rate of 1 tab/gallon to achieve 75 ppm free SO2.  

Can also be added to water to remove chloramine (1 tab is sufficient for roughly 5-20 gallons)

Sometimes referred to as "KMB" or "KMS"