Pretreatment of this machine has adopted stainles steel multimedia filter, active carbon filter to remove large size impurities and floating material effectively. Water input index of RO films is improved so that extraordinarysmell and remaining chlorine of the raw water can be effectively removed, the taste quality of the water is therefore improved. The main machine has applies high effvientlow pressure compound films fron U.S.A., desalt rate of single film may reach as high as 99%. Over high or over low pressure protection facilities imported from Korea have been applied so that the problem rate of the facility is almost zero. High class standing type stainless pump form LOWALA, U.S.A. has been applied The medical material imput system from Midunlo, U.S.A. has been apply, the standard of supplg water fully reach the national standwrd for pure water.