Campden Tablets
Tablets that contain 0.45g of sodium metabisulphite that release 50 ppm of sulphur dioxide in 4.5 litres of water. They are used as an effective preservative or for sterilising ingredients before use.
Campden tablets: A convenient way of delivering sulfites to wine. One tablet contains one-half gram of potassium or sodium metabisulfite.
Crush 2 campden tablets and place into a second clean demi-john, transfer the wine into this vessel using a siphon tube, and leave somewhere cool and dark to clear.
Campden Tablet
Potassium metabisulphite pressed into a tablet form. Generally more convenient that using the powdered form.
Carboy ...
CAMPDEN TABLET: See Sterilizer. Consists of sodium metabisulphate, when a tablet is dissolved in water or wine it releases 50 ppm (parts per million) of sulphur dioxide (DO NOT inhale - Bill Clinton).
"Campden" tablets are made of potassium metabisulphite. Each tablet, when fresh, contains 0.44 grams of it. However, if they are old, a lot of the SO2 will have been lost and their effects will be unreliable.
 See also: Wine, Bottle, Yeast, Fermentation, Taste
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