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A water ionizer (also known as a alkaline ionizer) is a home appliance which claims to raise the pH of drinking water by using electrolysis to separate the incoming water stream into acidic and alkaline components. Proponents claim that consumption of the alkaline stream results in a variety of health benefits, making it similar to the alternative health practice of alkaline diets. Such claims are not generally accepted in chemistry and physiology. The machines originally became popular in Japan and other Far Eastern countries before becoming available in the U.S. and Europe. ==Operation== Despite being described as 'water ionizers' the machines are designed to work as water electrolysers. This is an electrochemical process in which water is split to form hydrogen and oxygen by an electric current. The overall chemical reaction is shown below: : 2 H2O(''l'') → 2 H2(''g'') + O2(''g'') During this process the water near the anode is acidic while the water near the cathode is alkaline. Water ionizers work by simply siphoning off the water near the cathode. This contains increased levels of hydroxide (OH−) and would be expected to have a higher pH (i.e. be more alkaline). The effectiveness of the process is debatable because electrolysis requires significant amounts of time and power; hence the amount of hydroxide that could be generated in a fast moving stream of water (i.e. a running tap) would be minimal at best. Similar machines have been used to produce electrolysed water, which is used as a disinfectant because it also contains sodium hypochlorite, the main ingredient in bleach. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「water ionizer」の詳細全文を読む スポンサード リンク
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