Tartaric Acid is the most widely adjusted acid in wine making. Take a test with the Acid Testing Kit, and then use tartaric acid as needed. Every teaspoon of tartaric acid will increase the acidity by 0.1% per gallon.
I use this primarily in ciders for post MLF adjustments where malic and/or citric additions would be inappropriate. Since I also keep malic acid on hand for cider must adjustments and citric for cooking, I also use this to make my own three acid blends for fruit wines.
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Lowers the Ph of my Must
I use it to lower the pH of fermenting must so it doesn't spoil, and acts as a preservative when its done. It also adds some tartness. Easy to use.