... water treatment.which has get several international certification.... NSF,SGS,IAF,ISO CERTIFIEDSpun Bonded water ... made from the nonpoisonous and odorless polypropylene particle,which is heated and melted,sprayed, ... difference,high capacity of removing dirties,small size,high pressure-resistance,corrosion-resistance and so ... pressure difference is 0.02MPa,and the test media is clean water. Other filters ...