If you have an so2 meter (I don't!), you want to keep the wine at 50 ppm or so. What I do is add one campden tablet per gallon when making the must, at every other racking, and at bottling. As near as I can tell from doing some online research, this should closely approximate that figure.
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Broken Leg Brewery
Giving beer a leg to stand on since 2006
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