Marshall Jose wrote:

> No, one campden tablet is about right for a gallon of must, contributing
> 150 ppm total SO2. And I wanted to be heavy-handed this time since I was
> concerned about wild yeasts in last year's batch.

I think the very best way to add SO2 is from a "stock solution" made by
adding fenough water to 100 grams of Potassium Metabisulfite to enough
water to make the total volume 1 liter. This will produce a 10% solution.

Here is a "C" program to calculate how much of this solution to use:

{
float gallons, liters, ppm;

printf("Enter the number of gallons
of wine\n");

scanf("%f", &gallons);

printf("Enter the desired SO2 in ppm\n");
scanf("%f", &ppm);

liters = gallons * 3.785;

ppm = ((ppm * liters) / 100) / .576;

printf("The number of ml of stock solution needes is %.2f\n", ppm);

}

You could put the same math in a spread sheet without writing a "C" program.

For the documentation on this approach see page 37 of the following link:
http://brsquared.org/wine/Articles/SO2/SO2.htm

I started using this method of adding SO2 and it is very easy and probably
more accurate than campden tablets for reasons mention by Rotter in the
link above.

Paul




>
> wrote:
>>
>> I don't use campden tablets but I thout each tablet was good for 5
>> gallons of wine. I think you added 10 gallons of sulfite into 2
>> gallons of must. If you added yeast nutrient, I would say that the
>> campden tablets are your source of H2S.
>>
>> On Aug 29, 2:37 pm, wrote:
>>> I don't use campden tablets but I thout each tablet was good for 5
>>> gallons of wine. I think you added 10 gallons of sulfite into 2
>>> gallons of must. If you added yeast nutrient, I would say that is your
>>> source of H2S.
>>>
>>> On Aug 29, 11:17 am, Marshall Jose > wrote:
>>>
>>>
>>>
>>>> I picked and froze blackberries from a neighbor's plants, and when I
>>>> had enough (about 3kg) I prepared my must for the primary. After
>>>> crushing the fruit I added the usual things, including 1.5 tsp of yeast
>>>> nutrient in the form of food-grade urea. I also sulfited with two
>>>> Campden tablets primary must, which by this time was nearly 2 gallons.
>>>> This sat for 24 hours.