The 7th stage in the Santevia Gravity System is a combination of Maifan stones and bio-ceramic energy balls. During this stage in the process, mineral stones continuously release easily absorbed, ionized minerals into the water, including calcium, iron, magnesium, potassium, zinc, and other trace minerals. When removed from its source of alkalinity, the pH of water will decrease. The purpose of these stones is to maintain the alkalinity (high pH) of your water, while adding trace minerals. They mimic the natural effect of the rocks that line fresh mountain streams, and generate the same fresh, great tasing water.