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Raptor99

Fruit Wine Alchemist
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@Hesster1977 I have edited my above comment for clarity. Using the word "active" is unclear. Actually 0.19 g/gal refers to free SO2 in the wine, which is equivalent to 50 ppm. Since 1 g of Kmeta powder produces 0.57 g free SO2, you need 0.332 g/gal of Kmeta powder to produce 50 ppm free SO2.

The amount of free SO2 required depends on pH. Here is a chart I made on a spreadsheet:

Free SO2
pHppm=mg/LKmeta g/gallon
2.9​
11​
0.073​
3.0​
13​
0.086​
3.1​
16​
0.106​
3.2​
21​
0.139​
3.3​
26​
0.173​
3.4​
32​
0.213​
3.5​
40​
0.266​
3.6​
50​
0.332​
3.7​
63​
0.418​
3.8​
79​
0.525​
3.9​
99​
0.657​
4.0​
125​
0.830​


Sorry the formatting is a bit weird. I keep a print out of this chart in my wine making area. Later on I will look for the source I used for the data in the first two columns.

Once you get your digital scale, I suggest you purchase Kmeta powder.
 

Hesster1977

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That helps. I also found lots of helpful reference info on the “ More Wine” website. I ordered K- met powder as you recommended so I won’t deal with the tablet crap and calculations. Now gotta get a ph tester.
 

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