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Pseudoscientific home appliance
A water ionizer (also known as an 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. The machines originally became popular in Japan and other East Asian countries before becoming available in the U. S. and Europe.

Water ionizers are often marketed on the basis of health claims which are normally focused on their putative ability to make water more alkaline. A wide variety of benefits have been claimed, including the ability to slow aging, prevent disease, give the body more energy, and offset alleged effects of acidic foods. There is no empirical evidence to support these claims, nor the claims that drinking ionized water will have a noticeable effect on the body. Drinking ionized water or alkaline water does not alter the body's pH due to acid base homeostasis. Some proponents of alkaline water and the alkaline diet as a whole claim a link between alkaline intake and cancer prevention; and as such, several cancer societies have denounced this claim.

Despite being described as 'water ionizers', the machines are designed to work as water electrolyzers. In some machines, the process produces calcium hydroxide and hydrochloric acid through the use of an ion exchange membrane. 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 such as a running tap would be minimal at best. Unreliable source: sure=y Additionally, the process of reversing the reaction requires much less energy, so if the area between the alkaline and acidic water is at least semi permeable, the water will undergo another reaction that just leaves neutral water.