Showing slide 1 of 7 - Best Selling. Go to previous slide - Best Selling. Whatman 6900-2504 PVDF Gd/x 25 Sterile Syringe Filter 25mm 0.45 Micron. 5 out of 5 stars. (4) Total Ratings 4, $6.88 New. 100pcs PTFE Syringe Filters 13mm 0.22um Deschem. 5 out of 5 stars.