0.2 - 1.0 micron. 0.2 µm: General sterile filtration, sterile filtration of corrosive fluids, immunology, implant tissue and cell studies, air venting, aqueous fluids, air and gas sterilizing. FITC stain technique, Legionella pneumophilia - air conditioning water, DNA fragments filtration, phytoplankton, bacteria removal, deionized water