Acid water or acid ionized water (which is obtained with the help of a prime water ionizer) has a low pH and countless uses. You can count on it in so many areas of your life. As soon as you learn just what sort of benefits it comes with, you will not know how you have lived without it until now! To make things even clearer, alkaline water and acid water are both on the same spectrum, but at opposite sides. Alkaline water has a pH of over 7, while acid water â under 7.