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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2/27 2:30 AM Central: These are selling for just $5.80. Shipping is also free to many US addresses with Prime Membership [Try Prime for Free] or a qualifying order.  Prices and availability can change quickly.  Check product page for current info – More About Prices

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