Pall Laboratory GHP membrane will be discontinued November 1, 2019. ; 4554, Acrodisc Syringe Filter, 0.2 µm, GHP Membrane, Minispike outletspike outlet, 13 mm ( Syringe Filters - GHP Acrodisc® and GHP Acrosdisc® GF, Pall . General-purpose syringe type filter for most analytical filtration requirements.