Tisch Scientific Cellulose Acetate (CA) Syringe Filter, 0.22 µm, 4 mm, Luer-Lok/Luer Slip, Nonsterile, 200 Pack, SF17508. Regular Price: $172.98. Price $156.44. As low as: $140.80. Add To Cart. Nylon Syringe Filters, 0.22 um, 4mm, Luer-Lok/Luer Slip, Nonsterile, 200 per pack, SF17502. Regular Price: $167.97.