Malt naturally has high potassium contributions. Potassium can taste salty at high concentrations – brewers utilizing potassium softened water may have issue if malt contributions are high.

Common Values for Potassium

  Barley Malted Barley Wort US Tapwater Pilsen Water Burton-on-Trent Water Brewing Targets Levels in Beer
Potassium 4840 - 6280 ... 317 - 508 4.9 ... ... ... 200 - 450

 

Potassium levels of malt from various malthouses