Membrane Ra (nm) Rq (nm)
TFC 25.4 31.6
TFN-(Zr)-1 34.5 42.5
TFN-(Zr/Ti)-1 37.1 45.7
TFN-(Zr)-2 26.8 34.4
TFN-(Zr/Ti)-2 29.7 37.2