GHP Discontinuation - Accessories Spare Parts - Pall Shop. Pall Laboratory GHP membrane will be discontinued November 1, 2019. ; 4554, Acrodisc Syringe Filter, 0.2 µm, GHP Membrane, Minispike outletspike outlet, 13 mm ( 4562 - GHP Membrane - Acrodisc Syringe Filters, 25mm, Pall