Medical ball: 1.can purify and active the water 2.can absorb the pollution of water 3.can be a medicine for health building Red ... , selenium, iodine, titanium, nickel and iron, lithium, ge, can enhance the immune function, make the immune system, ring nucleotide control system, and neuroendocrine ... , tracheitis, etc have certain curative effect. Red Mineral ball for adjust the PH value in water