Mountain spring water belongs to hard water and is rich in many mineral ions beneficial to human body. However, long-term drinking will lead to excessive absorption and poisoning of mineral ions, and often lead to diseases of hepatobiliary kidney calculi. Boiling is the process of changing hard water into soft water, so that most mineral ions such as calcium, magnesium, manganese and iron that cause stones are precipitated and removed and become safe water.
It is best to choose an ion exchange water purifier. Activated carbon purifiers generally only remove impurities and sundries.
Generally speaking, once water is boiled, it can be used safely.
I hope the above summary is useful to you ~