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Merck
Whatman® MicroPlus STL membranes for microbiological control MicroPlus-31 STL membrane circles black, for Membrane-Butler, cellulose nitrate, diam. 50 mm, pore size 0.45 μm, white grid, sterile, pkg of 400 ea

Whatman® celluose nitrate MicroPlus-21 STL filter discs 0.45 μm pore size

Whatman® MicroPlus STL membranes for microbiological control MicroPlus-31 STL membrane circles black, for Membrane-Butler, cellulose nitrate, diam. 50 mm, pore size 0.45 μm, white grid, sterile, pkg of 400 ea