If it is what I think it is, it makes the water very alkaline by a process of electrolysis.
This Alkaline Water will neutralize your stomach acid and impair digestion.
Bottom line is, you drink this high pH water and it is neutralized by the stomach acid.
This whole 'body needs to be alkaline' is sales marketing gimmick stuff. It is a seductive theory though...
Certain parts of the body need to be acidic like the stomach, and certain parts are alkaline, such as the mouth.
If anything, what the body needs are minerals, not the OH- ions this machine will create in the water.
The easiest way to obtain these are by eating a whole food supplement containing wheat grass, barley grass, alfalfa, chlorella, dulce, and the like.