Added to mash water to lower pH and increase sulfates. Increases perception of hop flavor and hop bitterness. Epsom salts (Magnesium Sulfate) are a standard component of "brewing salts" mixtures to approximate the Burton-On-Trent brewing water.
Usage: Varies depending on base water chemistry. Use up to 1/2 tsp per 5 gallons. 1 gram per gallon adds 103 ppm sulfate, 26 ppm Magnesium.
Chemical name: Magnesium Sulfate, MgSO4