Acrodisc® Syringe Filters with GHP Membrane, Pall Laboratory. Supplier: Pall Laboratory. 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. Download our application note under 'Related Items' below to see how our next generation universal membrane wwPTFE outperforms the GHP membrane.