In 1968, Toray began the investigation of membrane water treatment technologies and has developed many types of membrane to separate the impurities in different sizes for the perfect water purification. Toray is currently one of the leading companies in the world. The hollow fiber membrane applied to water purifiers Torayvino was developed based on medical technology, used for artificial kidneys. The reduction of bacteria is compliant to the Japan Wind Power Association (JWPA) of voluntary standards for water purification. The water purifier has been proven to remove 99.99% of bacteria as defined in the standards.