Ahlstrom 151, 0.7¬µm - Slow Speed is a high performance grade designed to retain extremely fine particles down to 0.7 ¬µm. Has retention comparable to membrane filters while providing higher flow and loading capacity. Recommended for filtering fine precipitated proteins. In the filtration of nucleic acids and difficult biochemical solutions, Ahlstrom 151 is used in combination with Ahlstrom 141 as a highly efficient protective and retentive pre-filter to extend the loading capacity of membrane filters. Grade 151 is recommended for use in TCLP testing as described in test methods for evaluating solid wastes, EPA method 1311.