The chemical composition is actually potassium nitrate.

化学成分实际上是硝酸钾。

It is a spa town with natural and thermal springs filled with minerals, including sulfur and potassium nitrate.

这是一个温泉小镇， 拥有天然温泉和富含矿物质的温泉，包括硫磺和硝酸钾。