Not all ice makers require distilled water to make ice cubes. If your ice maker tells you not to use distilled water, this is because distilled water does not contain minerals. Ice makers have a sensor that senses or relies on the mineral content of the water, and this mineral content will determine how much more ice needs to be made. These types of ice makers cannot detect distilled, purified RO water due to the absence of mineral content in the water. In such a case, add a pinch of salt to the distilled or purified water to balance or increase the mineral content for the electronic sensor to detect the minerals.