Nov 1, 2021 · PTFE Syringe Filters, 0.22 um, 25mm, Luer-Lok/Luer Slip, Nonsterile, 100 per pack, SF14468. Regular Price: $128.55. Price $93.59. As low as: $84.23. Description. Description. Whatman 25 mm Puradisc Filters are produced from pigment-free polycarbonate with standard inlet (female luer lock) and outlet (male luer) connections.