It follows from the recommendations of tea expert Sebastian Michaelis that tea should always be prepared only from a fresh portion of water, without boiling it twice.
an interview with Sebastian Michaelis listed the mistakes often made when brewing tea. One of these mistakes, the specialist called the re-boiling of the liquid remaining in the kettle. Michaelis emphasized that good tea is made exclusively from fresh water.
“The main secret of brewing a delicious and rich drink is water. Use only fresh water for tea, never boil twice the water left in the kettle from the last time,” the tea expert emphasized.
In addition, he shared the following tips that are useful when brewing tea.
- Black tea should be brewed with boiling water immediately after the water boils.
- Green tea brewing with boiling water is a mistake: the water should not be hotter than 85 degrees.
- When using a tea bag, remove it follows from the container in 2-3 minutes.
- Those who drink tea with milk should add milk to the drink, and not vice versa.
Earlier, the MedikForum.ru portal wrote about that drinking hibiscus tea can effectively help in the fight against hypertension. 
Sebastian Michaelis Healthy Tea Expert, Master Tea Mixer at Tetley