RO pretreatment filter MWCO: 5k-500k Dalton Material:PVC,PAN,PVDF,PP,PS, ... ,SS,FRP RO pretreatment with Ultra filtration membrane water filtering filter for water treatment with different membrane material (PES,PS,PVDF ... -180daysChemicals Flushing Time15-120minsChemicalsCitric acid,NaOH / NaClO,H2O2 UF membrane filter for pretreatment of RO