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Diameter: 2.5cm Grade GF/A; Retention: 1.6µm Fine particle retention; high flow rate; good loading capacity; used for high efficiency general purpose laboratory filtration Uses include water pollution monitoring of effluents, water filtration, algae and bacteria cultures, foodstuff analyses, protein filtration, radioimmunoassay of weak ß emitters Recommended for gravimetric determination of airborne particulates, stack sampling and absorption methods of air pollution monitoring