The project pretreatment water into the ultrafiltration system, the use of ultrafiltration membrane screening to retain most of the non-dissolved impurities, so that key indicators such as SDI to meet the needs of RO feed water. Ultrafiltration system also has a part of COD, chromaticity removal effect; LUXI Chemical chemical water expansion and renovation project of the successful application of ultrafiltration device will promote the net source of high-performance PTFE hollow fiber composite membrane products in the boiler chemical water treatment field demonstration effect.