Whatman syringe filters can be found in different diameters, pore sizes, and membrane types. Select from sterile or nonsterile versions without or with prefilters.Syringe filters are the primary option for analytical sample filtration. Whatman Puradisc 25 mm PTFE Syringe Filters, 1.0 µm, 1000 Pack, 6798-2510 Regular Price $1,534.70 Price $1,334.52