Pure water electric kettle will not have scale. What is the principle? My grandmother installed a set of reverse osmosis water purifier. Half a year later, I found that the bottom of the new kettle was the same as the new one.
Scale is formed by calcium and magnesium plasma in water and carbon dioxide, called calcium carbonate, which is deposited on the wall of the pot. Reverse osmosis equipment removes calcium and magnesium plasma from water. Therefore, scale is no longer generated.
As water flows through limestone areas, calcium and magnesium ions in the water are dissolved. Many mountains or caves on the earth are formed by water dissolving rocks.