Calcium Carbonate (CaCO3) aka chalk is used to raise pH of the mash.
 
Lowers acidity in wine. Use 1/2 teaspoon per gallon to lower acidity 0.1%. Use before fermentation.
    
Calcium Carbonate (Chalk) - 2/oz
            
                
            
            
            $1.79
                
                
                
                
                
                    
                    
                    
                
        
         
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