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First of all ryangws the kits do not have you add the sulfite to stop the fermentation. You don't add it to the kit until fermentation has ceased. It merely protects the wine by creating an inhospitable environment for yeast and bacteria to grow- causing spoilage, etc.
Let the wine finish fermenting, although it should have been done long ago. Verify it is done by taking SG readings with a hydrometer. If you don't have one, get one (less than $10). SG readings the same for a few days in a row means it is pretty well done. Since the wine was begun July 12, assume it is finished fermenting. If it is still bubbling, it is from an accidental malolactic fermentation. I would sulfite it now with k-meta or campden tablets at the normal dosage of 1 tablet per gallon or 1/4 tsp per 5 gallons of wine. That will raise the free sulfites level to a level that will stop further microbial activity. Wait for a week or so and monitor any further bubbling. If it ceases and is clear, then bottle it.
Let the wine finish fermenting, although it should have been done long ago. Verify it is done by taking SG readings with a hydrometer. If you don't have one, get one (less than $10). SG readings the same for a few days in a row means it is pretty well done. Since the wine was begun July 12, assume it is finished fermenting. If it is still bubbling, it is from an accidental malolactic fermentation. I would sulfite it now with k-meta or campden tablets at the normal dosage of 1 tablet per gallon or 1/4 tsp per 5 gallons of wine. That will raise the free sulfites level to a level that will stop further microbial activity. Wait for a week or so and monitor any further bubbling. If it ceases and is clear, then bottle it.