Decoction tools In the process of decoction, after high temperature and high heat, the active ingredients in some drugs will undergo some complex chemical changes. So decoction should use chemically stable pottery and porcelain as decoction tools, not copper, iron and other metal tools. The quality of water is closely related to the effectiveness of the medicine, so the water must be clean. Clear spring water, river water, well water, tap water and other pure drinking water can be used. The amount of water used for decoction has a great impact on the quality of the decoction. Adding too little water does not allow all the active ingredients to be decocted, adding too much water increases the decoction time and makes some of the ingredients in the drug damaged or lost. Generally, the water added to the drug should exceed 2-3 cm above the surface of the drug. The heavy body of the drug, add less water; light bubble loose drug, add more water; quality of the firm oil moist drug, so add less water; dry texture of the drug, so add more water; aromatic drugs decoction time is short, add relatively less water; tonic nourishing drug decoction time is long, add relatively more water. Before decocting, the drug should be properly moistened so that the water can fully enter the interior of the herb, thus improving the decoction rate of the active ingredients. Drug soaking time of 30-60 minutes is appropriate. Flowers and leaves can easily absorb water, soaking time can be shortened; roots, stems, bark, fruits are heavy and hard to absorb water, soaking time can be extended. Summer soaking time is slightly shorter, winter soaking time is slightly longer. The medicine containing volatile ingredients should be soaked in cold water, and the hard medicine should be soaked in warm water. Decoction time 1, decoction with sweating, detoxification of muscle rash and other effects of the decoction should be strong fire open pot decoction, the first decoction generally 15-20 minutes, the second and third decoction 10-15 minutes. 2. Decoction of diuretic with dampness should be made with strong fire, 20-25 minutes for the first decoction and 15-20 minutes for the second and third decoctions. 3. Decoction of liver and qi regulating, menstrual and blood regulating formula should be cooked with low and strong fire, 20-25 minutes for the first decoction, 15-20 minutes for the second and third decoctions.