When you use the tap water to take shower or immerse in the sterilized water; the chlorine will be absorbed by your skin – the largest organ of body. As time goes by, it will cause physical uncomfortable or skin illness.
The fact is our daily use tap water contains chlorine for disinfection.
Besides the chlorine, there are some invisible algae, bacteria, and heavy metals in the tap water, too. According to the report, these substances will complex to THMs (trihalomethanes) – a chronic carcinogen substance. When the THMs pass through the breathing passages to lung and accumulated in our body, it is not easy to sweep it away and it will becomes a chronic carcinogen factor someday.