Avoid choosing water sources with poor water quality to freeze into blocks, which contain many impurities and are turbid when forming ice cubes.
Choose cool boiled water to reduce bubbles in water. Too many bubbles in ice cubes will reduce the transparency of ice cubes, and boiling water can reduce the gas in water.
The water poured into the container should not be too full, and it should be separated from other items during quick freezing to prevent impurities from entering.