Campden Tablets (potassium metabisulfite). 100 Tablets.
Campden tablets are also used to remove chlorine and chloramine from brewing and wine making water.
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Campden Tablets (sodium metabisulfite) – 2 Oz(100 Tablets) – note that multiple variations of this product may be available, as such a different version may appear at this link
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Make sure the components you use are compatible and rated for your intended application. Contact manufacturer with questions about suitability or a specific application. Always read and follow manufacturer directions.