Alum can not be replaced by salt, alum is a Chinese medicine, has a certain effect, but the salt is food, does not have any drug effect.
Alum is a sulfate mineral alum stone by processing and refining made of cold, internal use has stop bleeding and diarrhea, expectoration of wind and phlegm effect; external use has detoxification and insecticide, dry dampness and itching effect, can be used for leakage (excessive menstrual flow or dripping more than one), hemorrhage, epistaxis, diarrhea and dysentery, prolonged anal prolapse, hemorrhoids, eczema, scabies and other medical conditions of the treatment.
Salt, on the other hand, is a common condiment and does not possess any medicinal properties. Therefore, alum can not be replaced by salt, which may affect the treatment. If you are not feeling well, it is recommended that you seek medical advice, follow the doctor’s instructions, and do not blindly replace your medication.