Natural and Artificial Alkaline Water
There are two types of alkaline water: 1. "artificial" alkaline water which is generally tap water run through an electrical ionizer (electrolysis is also known as a water ionizer) to make the pH more alkaline and 2. bottled spring or mineral water through a filtration process. Natural spring water passes through rocks and soil and picks up various minerals, which affect its pH. Naturally-occurring mineral water contains alkalizing compounds, such as calcium, silica, potassium, magnesium, and bicarbonate.
Spring Aqua water system (EcoSystem in a Box) follows the natural spring water process of rocks. It uses no electricity and produces a pH of 9.0-9.5 on right side handle and 7.2-7.8 pH on left side handle creating a natural pH Balance.
Spring water with naturally occurring minerals seems to be the healthiest type of alkaline water source. "A good source of alkaline water is spring water -- usually a pH of 8 to 8.5 -- that naturally becomes alkaline by acquiring minerals as it passes over rocks," according to Lawrence Wilson, M.D., who specializes in nutritional balancing at the Center For Development in Arizona. 
An alkaline pH is only beneficial to the body if it is natural, i.e. due to minerals in the water. All water coming from nature has a pH that perfectly corresponds to its mineral content.
The most common side effects of consuming water with an unstable and artificial pH is nervous tension, over-alkalization of the digestive system, and compromised immune function. However, much more severe side effects were revealed in a clinical study involving rats. The study revealed injury to cardiac tissues (heart muscle) resulted from drinking alkaline ionized water. In a time when cardiac disease is a leading killer, electrolyzed alkaline ionized water is not an appropriate choice for drinking water.
NATURALLY ALKALINE VS. ARTIFICIALLY ALKALINE WATER: THE PROCESS EXPLAINED
In nature, water flows down mountain streams and picks up alkaline minerals from the porous rock through which it runs, affecting its pH and making it naturally alkaline. Nothing more is done to the water to make it "alkaline".
Companies have created machines that make water alkaline though something called ionization or electrolysis. During electrolysis, water ionizers split apart water molecules with electricity to artificially create alkaline water. Tap water is run over platinum and titanium plates which causes the exchange of ions that make the water more alkaline in its pH.
All water in nature has a pH that correlates to the minerals in the water. When you consume alkaline water, the body is under the impression that it is receiving alkaline minerals like calcium and magnesium. Thus, when the body encounters ionized water, it believes it is receiving more alkaline minerals than what is actually present in the water, causing it to deplete it's own mineral reserves and potentially resulting in a mineral deficiency. Essentially, ionized or alkalinized water = a "synthetic" pH = missing minerals= depletion of one's own mineral reserves.