Alkaline ionized water is slightly alkali electrolyzed water with a pH of 9 to 10 created on the anode side by direct-current electrolysis of drinking water including calcium ions (when necessary, with the addition of calcium lactate, etc. as an electrolysis promoter) using an alkaline ionized water apparatus. (On the other hand, slightly acidic electrolyzed water generated on the cathode side with a pH of 4 to 6 is termed "acidic ion water".)

Further, the electrolysis promoter to be added is limited to calcium compounds approved as food additives.

As shown in the figure below, an alkaline ionized water apparatus generally has an electrolysis tank with the cathodes and anodes separated by a barrier membrane such as an ion exchange membrane, and the barrier membrane has the function of allowing the passage of ions in the water but preventing the passage of the water itself.

Raw water containing calcium ions is put into the electrolysis tank. When a direct voltage is applied, direct current flows and the positive ions (M+) such as calcium ions, magnesium ions, potassium ions, sodium ions, etc. are attracted to the anode, and the negative ions (X-) such as chloride ions, carbonate ions, sulfate ions, nitrate ions, etc. are attracted to the cathode.

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