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GRADE 4 : 7cm - Equivalent to Whatman qualitative grade 4, standard lab filter paper (70mm) FAST PRE-FILTER - Quickly clean-up biological samples and organic extracts, routine clarification WINE MAKING - Filtration of musts HIGH AIR FLOW COLLECTION - Collect large particulate in fast moving air or fumes COARSE RETENTION / FAST FLOW - Retains coarse and gelatinous precipitates (20~25 micron)"