Sodium sulfate tablets is used for intestinal cleaning of adult patients before colonoscopy. Colonoscopy is to check whether there is abnormal structure in the inner wall of the large intestine (colon) and can be recommended as a screening item for colorectal cancer. Taking this set can clean (or completely) the colon, so that the examination is accurate and comprehensive. Determine the percentage ratio of sodium sulfate, anhydrous magnesium sulfate and potassium chloride in the tablet to the labeled amount to confirm the quality of the drug.