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GRADE 2 : 7cm - Equivalent to Whatman qualitative grade 2, standard lab filter paper (70mm) AGRICULTURE - Soil pre-filtration, fertilizer analysis, nutrient absorption in seed tests BREWING TESTS - Beer and malt analysis, removal of turbidity in wort and yeast filtration AIR / GAS FILTRATION - Pollution monitoring of specific atmospheric contaminants, smoke HIGH RETENTION / SLOW FLOW - Retains fine crystalline particles (5~10 micron)"