Not necessary, as long as the impurities in the mixture are precipitated out, the clear water on the upper layer can be filtered out. Goushui, also known as alkaline water, or edible goushui, is a compound food additive, which can be made by itself or purchased off-the-shelf.

Do I have to leave the homemade water overnight before I can use it?

Goushui is a compound food additive, which is generally used to make Cantonese-style moon cake skins. Adding hook water can not only neutralize the acid in the invert syrup, prevent the moon cake from sour taste, but also adjust the hardness of the moon cake skin.

Adding a proper amount of water to the moon cake skin is not only beneficial to the coloring of moon cakes, but also makes the moon cake skin more loose and not deformed.

Guishui is an alkaline mixture, and its main components are potassium carbonate and sodium carbonate.