The acidity of must/wine is always expressed in grams of tartaric acid/litre. In French books, you will find the acidity expressed in sulphuric acid ÷ 1.53. Acidity as tartaric acid = acidity as sulphuric acid x 1.53.
Pectic enzyme is a preparation that facilitates obtaining juice from fruit. It useful in home wine making. Directions for use: Pour a small amount of water (1 to 3 l / 10 kg) over ground fruit. Water temperature: 40°C (berries), 80°C (apples, pears, plums and quince fruit).