Exclusive supermac mineral stones are mined between 300 and 600 metres below sea level in an unpolluted Korean island. Supermac mineral stones contain germanium which is health giving and cancer preventing. Germanium does not contain heavy metals but absorbs heavy metals. toxicants. odours and impurities.They continuously release more than 20 kinds of ionised minerals and also aid in the oxygenation of water and the adjustment of the pH of water to mild alkaline. These mineral stones are porous which slowly release minerals such as germanium. calcium potassium. magnesium and iron.