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Whatman GD/X syringe filters from GE are specifically designed for filtration of viscous or otherwise hard-to-filter samples with high solids content. -Glass fiber prefiltration stack for filtering larger sample volumes with less back pressure build-up -High loading capacity for samples with high solids content -Processes three to seven times more sample volume than filters without prefilter Sterile GD/X options are also available from GE Healthcares Life Sciences business. Constructed of a polypropylene housing with a prefiltration stack of Whatman GMF 150 (graded density) and GF/F glass microfiber prefilters, GD/X syringes enable exceptional loading capacity with high flow rates for difficult-to-filter samples. This design prevents the buildup of back pressure typically caused by the blocking of an unprotected membrane. GD/X syringes are suitable for capillary electrophoresis, HPLC, and UV/VIS sample preparation when dealing with viscous or otherwise difficult-to-filter samples with high solids content.