Ultra-filtration (UF) o se auala e vavae ese ai membrane e faʻamama ma vavae ese fofo.Anti-filogia PVDF ultrafiltration membrane faʻaaogaina polymer material polyvinylidene fluoride e pei o le ata tifaga autu mea mata, PVDF membrane lava ia e malosi faʻamaʻi faʻamaʻiina, pe a uma le faʻaogaina o mea faʻapitoa ma e iai le hydrophilicity lelei, i le faagasologa o le membrane e ala i le mamanu micropore faasaienisi ma le micropore structure control, micropore tele pore o'o atu i le ultrafiltration tulaga.O lenei ituaiga o oloa membrane ei ai le lelei o pores toniga, maualuga filtration sa'o, maualuga vai penetration i vaega vaega, oxidation tetee ma maualuga tensile malosi.