Cytiva's Whatman GMF 150 prefilters are multilayer graded density filters for rapid and efficient filtration of samples with high solids content. Compared to an unprotected membrane, greater sample volume can be filtered Higher particulate loading capacity and faster flow rates than uniform prefilters Excellent particle retention (both large and small particles) 100% borosilicate glass, binder-free Extends life of final filter membrane Multilayer filter design When a sample is applied, the multigrade glass filter traps larger particles in its pores or on the surface of the coarse layer, medium-sized particles in the interface meshing, and smaller particles in the interstices of the fine layer. The multilayer design provides comprehensive particle retention. Cytiva's glass microfiber prefilters