Superior grade filters for a variety of biological and environmental methods Reduces filtration costs and premature clogging when filtering difficult to filter or highly contaminated solutions. Extends filter life and reduces final filter changes with high capacity prefilters. Eliminates sample contamination. Binderfree borosilicate glass fiber has no added extractables. Filters a wide range of particulate loads and viscous solutions with a selection of filter thicknesses from which to choose. Filters with binder offer excellent wet strength for easy handling and filter integrity Extra Thick Glass Fiber Filters deliver high particulateholding capacity for efficient depth filtration of large volumes of solutions.