These flakes are caused by calcium carbonate and magnesium carbonate, both of which are found in hard water and appear as white flakes when the water is frozen or boiled. Calcium carbonate and magnesium carbonate are harmless, but if you want perfect, flake-free ice cubes, you will need to soften your water.Click to see full answer. Moreover, why do my ice cubes leave residue?Calcium deposits in water cause white flecks in ice cubes especially as it melts. When water freezes and thaws, the minerals in it concentrate and the thaw cycle contributes to this. Ice shrinks as it evaporates, leaving this concentrated mineral ‘residue’Also, what is the stuff floating in my water? If the particles floating in your water are tan or white, this means that what you’re seeing probably comes from naturally occurring mineral deposits, such as calcium carbonate or magnesium carbonate. These minerals can build up in your plumbing systems over time and eventually break off into your water. Thereof, why is there white powder in my ice maker? The white substance you see is calcium. Calcium is in the water supply and is not harmful. This is because the ice has frozen the calcium and as the ice melts, it will leave the white calcium in a powder form. The only way to remove calcium is with a water softener.What is the white stuff on ice?White particles in melting ice is actually minerals in your water. All water contains some dissolved minerals, and areas with high mineral content are considered to have “hard water”. The particles are usually calcium carbonate. The colder water becomes, the less capable it is of suspending minerals.