... , 20-40 eye, 40-80 mesh, 80 mesh. The ball has MaiFan quarry for 2-4-5mm 3mm, 8-9mm.Introduction and usage ... shows that it contain dozens of maifan stone with the body's immune function, blood, cardiovascular function and to maintain the normal ... pollution caused by adsorption harmful components and various bacteria group, the water become unclean, and active mineral water dissolution of beneficial ...