Comparative Performance of Four Methods for High-throughput . Apr 9, 2014 In the past few years, several methods for high-throughput analysis of 96-well GHP Filter Plates (Pall Corporation, Dreieich, Germany). Membrane Discs with GHP Membrane, Pall Laboratory - VWR. Pall GHP Polypropylene membrane will be discontinued effective October 31st, 2019.