Hydropbobic PTFE Membrane Filters, Pore:0.22 (μm), Diameter:25 (mm), 200pcs/pk. AM25PTB45. Hydropbobic PTFE Membrane Filters, Pore:0.45 (μm), Diameter:25 (mm), 200pcs/pk. AM25PTB01. Hydropbobic PTFE Membrane Filters, Pore:0.10 (μm), Diameter:25 (mm), 200pcs/pk.