What kind of water to use to make clear ice balls?
To make clear ice we recommend using distilled water, boiled water, or water that comes out of a reverse-osmosis (RO) system. It may not come out perfectly clear but at least the ice will not appear cloudy. If you are looking to making clear ice it is more about the method of freezing than the water. The cloudiness in the H20 is caused by the O being trapped in the H. Alcademics has some cool tricks on how to control the freezing process so all of the air in water is expelled, leaving your ice clear.
We developed a ice making system called Clearspheres that leverages directional freezing to create crystal clear ice spheres.