Pure Phosphoric acid can be used as a non foaming non rinse sanitiser when diluted with water to a concentration of 1ml/2 litrees.

Phosphoric Acid is excellent at passivating stainless and for adjusting ph of sparge water.

Phosphoric Acid can be compleetelyh metabolised by hyeast and will act as a yeast nutrient if it ends up in your fermenter a ta low enough concentration