Products › Lactic Acid 88% Image 1 of 1 Lactic Acid 88% $4.75 4 fl. ozUsed to lower pH in Mash and Sparge Water. Use 1-2 mL per gallon to lower the pH by 0.1 Quantity: Add To Cart Added! 4 fl. ozUsed to lower pH in Mash and Sparge Water. Use 1-2 mL per gallon to lower the pH by 0.1