1, the best choice for soaking Xueyan is mineral water or cold water. If there is no mineral water, you can boil a pot of hot water, let it cool and soak it. The soaking time is 4 hours, 20 hours and 3 days, and the soaking time of different varieties of swift is different.

2. If you use hot water to soak, it will lead to nutrient loss and affect the taste, so generally do not use hot water to soak Xueyan. Snow swallows will swell 30 to 50 times after absorbing water. Don't soak too much at a time. Prepare a bigger bowl and add cold water. Xueyan is soaked in water for about 20 hours, and the water is changed twice.

It's best to pour out the water soaked by Xueyan, especially when it is soaked for the first time. Because the impurities in the snow swallow, such as dizziness, wood residue and so on, will be mixed in the water when soaking. This kind of water is not clean and can't be used twice. It's better to soak it and throw it away. Although there will be some nutrients in the water, it is not a lot and can be dumped directly. Moreover, the water should be changed when soaking in the middle, and the water changed later can be used.