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Expensive commercial ice makers are able to make the clear ice by freezing the ice in thin layers to allow the air inside the water to escape. They basically spray a thin layer of water onto a cold metal plate in the freezer and keep doing that until it builds up into the size desired. These huge blocks obviously need a special freezer compared to cubes for a beverage.
Reproducing these results at home in an ice cube tray is really difficult. You need to start with distilled water and boil it a few times to try to drive out the dissolved air. Pouring and freezing in layers helps a lot but takes forever.
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