Ultrafilter’s alternative range for Walker filter elements

X1 – FF: Retention rate 99,9999 % at 0,01 micron, residual oil content 0,05 ppm
XA – SMF: Retention rate 99,99999 % at 0,01 micron, residual oil content 0,01 ppm
AC – AK: Residual oil content 0,003 ppm (with SMF-prefilter)