Liquid caustic soda is also the liquid form of sodium hydroxide. The reaction speed of liquid caustic soda is relatively fast, and it is easy to crystallize at ultra-low temperature, which requires high operation. The concentration of liquid caustic soda for industrial use is generally 30% - 40%, and the specific concentration depends on the characteristics of the wastewater to be treated. It can be adjusted at any time according to different regions and wastewater characteristics.