General tea brewing water temperature to reach the degree of boiling foam, the water temperature standard is about 90 ℃. After the water boils, the amount of dissolved oxygen in the water decreases dramatically. The best way is to control the water from boiling, can keep more dissolved oxygen in the water.
In practice, there are many difficulties, usually let the water full boil and then cool down. This can be avoided if you use a thermometer, or if you are familiar with the water temperature, and the tea does not need to be brewed at too high a temperature. After the water has come to a full boil, the use of water and utensil stimulation, such as a high flush, or even the addition of a pot lid as the stimulated object, can increase the amount of dissolved oxygen a little.
Particularly green tea, white tea, dissolved oxygen in the water demand is high, so not only the water is not boiling, but also add a fine water high flush, and then divided into two or three times to brew tea, you can get a better taste.