The use process of the bath salt ball is like throwing an oversized effervescent piece into the bathtub to quickly bubble. Ordinary bath salt is mainly composed of natural land salt, natural sea salt, minerals and plant essential oil. The bath salt ball is added with small threonine and citric acid, so it has effervescent effect when it meets water. Its main materials are citric acid and sodium bicarbonate, and then added with surfactants and anti caking agents, as well as sodium sulfate and sodium chloride. It will soon dissolve in water.