Syringe-driven filter units are available in 0.22, 0.45 and 0.8 micron pore sizes with pvc housings. Membranes available include mf-millipore (mixed cellulose esters), nylon, durapore (pvdf) or polytetrafluoroethylene (ptfe). The 13 mm units are recommended for filtering volumes from 1 to 10 ml. The 25 mm units are recommended for filtering volumes from 10 to 100 ml. 100/pk
