Standard filter for collecting suspended solids in water. Loading capacity is good, with a flow rate of 105 ml/sec. Effective retention is 1.2 µm. 250 ml/m2 water absorption. Used also for monitoring certain pollutants, e.g., Hg in water. Used to filter particulate components in sea water in marine chemistry. Extensively used in biochemistry, e.g. for harvesting lymphocytes during incorporation trials. Used in RIA procedures. (For cost savings, see Ahlstrom equivalent, 461-600-21 Series)