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Potassium metabisulphite in an effervescent granular form, in sachets pre-dosed with 2 grams of sulfur dioxide. Ideal for the sulfitation of wine stored in barrique. 
Recommendations: Sulfiting barrel; small vessels; homogeneous S02 released
Dosage: 1 pack of releases 2g of SO2
               1 pack of dose 5 releases 5g of SO2