Feb 15, 2022 · 28139-550CS 894.3 USD. 28139-550 28139-548 28143-264. Acrodisc® Syringe Filters with GHP Membrane, Pall Laboratory. Filters Syringe Filters. Pall GHP Polypropylene membrane will be discontinued effective October 31st, 2019. This discontinuation affects devices including syringe filters, filter plates, centrifugal devices and membrane filter discs.