Purification: The porous structure of the stones adsorbs contaminants like chlorine, heavy metals (lead, iron), and bad odors.Mineralization: As water passes through, the stones slowly release trace amounts of calcium, magnesium, potassium, and sodium back into the water.pH Balancing: These systems often buffer the water, raising its pH to a slightly alkaline level (typically 7.5 to 8.4), which many find more palatable than the "flat" taste of purely distilled water