Ultra filtration system utilizes a different molar weight cut-off (MWCO) to filter and separate a variety of small suspended particles, organic resin in the water, and reduces the TOC.It can be used before the RO system as pretreatment of raw water, and can be used at the end of ultrapure water system to remove small particles in pure water. The removal rate of organic matter is up to 99% and SDI<1, so that can increase water purification acquisition of the RO system, and extend the life span of RO membrane.UF uses “Inside-out”pressure type of hollow fiber membrane silk. The equipment could automatically collect water, back flush and so on with extremely easy operation to reduce the unstable factors caused by human operation and complicated management.