The SO2 that you smell is produced by yeast desperate begging for nutrients, Nitrogen in particular IIRC. Please feed the yeast some DAP and yeast nutrients, not the generic stuff for beer, but something like "Fermaid K" or "superfood" used in wine making. Montrachet is notorious for requiring high levels of Nitrogen and nutrients. I typiclly use wine yeasts requiring low nutrient levels and have never had a problem. <toucheswoodsmiley>
Have a look at yeasts from Lallemand and Lalvin and their nutrient requirements and their propensity to produce SO2.
Lallemand Wine - Yeast Quick Reference Chart
Lalvin Strains
Regards.
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Relax, don't worry etc. and so on.
Primaries: Old Ale, Barleywine, ESB, Scottish 80/.
Secondaries: Lime Wine, Strawberry-Banana Mead, Carmenere (from 144 lbs of grapes!), Engl. Barleywine, Modded JOAM, Concord Grape Pyment.
Kegs: Choc/Coffee Stout, Saison, Dry Stout.
Bottles: Belgian Str. Dark, Dubbel, Cider X 2, Modded JOAM, RJS Pinot Noir, RJS Aussie Cab. Sauv.
Coming soon: Blueberry Mead.
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