No need.

Pour water into the kettle and boil it, then let it cool to 50 degrees, then add lemon slices, add an appropriate amount of salt, and if you like sweetness, just add some rock sugar or honey. Be careful not to use 100-degree boiling water, preferably warm water.

Because the related substances in salt can effectively reduce the acidity of lemonade to a level acceptable to the human mouth, and at the same time, salt can also increase the related atmosphere of lemonade.