When water is boiled, the alkalinity decreases, and at worst, it becomes very weak, almost neutral, that's for sure, some people have done experiments. And the alkalinity drops as it sits for a longer period of time because of the CO2 in the air. When water is heated and boiled, the minerals in the water become precipitates (scaling in the kettle, too), and the mineral ions decrease, and the alkalinity decreases! In other words, alkalinity has something to do with the minerals in the water. High-quality spring water and mineral water is alkaline, pure water (does not contain any substances) is acidic, mineral water because of artificially added minerals (containing strong acidic ions), although it contains minerals, but is acidic. Water purifier can purify the water, such as can retain the minerals in the original water at the same time, can maintain the weak alkaline water; on the contrary, if in the purification process, will be beneficial to the human body in the water minerals are also filtered out, and out of the water is neutral, but also very easy to react with the air is acidic. Can also give an example, you contact or understanding of electrolytic water maker? Multi-functional water maker? A water maker that specializes in making alkaline living water! When I did not want a water purifier, but at home installed electrolytic water maker, is to consider the water is alkaline, and, alkalinity can be adjusted, such as daily drinking gear (PH = 7.5), young people to drink; the elderly or the chronically ill, need to improve the acidic body, as a health care for medical purposes, choose the strongest gear. Electrolysis water maker out of the water called alkaline water, in order to maintain its alkalinity and activity, the requirements of raw drinking, heating, not more than 40 degrees, and, as good as now to drink, placed for a long time, the effect is not good.