Specificationsmedical stone: a).water purification function b).non-toxic, harmless c).greater capacity of absorptionMaifan Stone is non-toxic, harmless and has a certain biological activity of compound mineral or medicinal Its main chemical components are inorganic aluminosilicate. These include SlO2, Fe2O3, FeO, MgO, CaO, k2O, Na2O, TiO2,..