500gm Sodium Bicarbonate (baking soda) (bicarb of soda)

Raises pH by adding alkalinity.

If  your pH is too low and has low residual alkalinity, then you can add alkalinity.  

Monitor the mash pH with pH test papers to determine how much to add. Add directly to the mash

Sodium Bicarbonate is An excellent NON TOXIC NATURAL CLEANING PRODUCT to deodorise and clean oak barrels and all brewing, distillation and winemaking equipment