When conducting analytical filtration in your lab, we understand that particle retention efficiency is critical to your research. Producing accurate results in this type of testing is especially dependent on the filter’s performance in retaining microbes on the membrane. We built our Nalgene analytical filterware products with all of this in mind. For over 50 years, we have provided precise, easy-to-use systems for the recovery of microorganisms and particles for QC testing and research. Devices exceed recovery requirements set forth in ISO 7704. CN membranes are manufactured for use in the bacteriological analysis of potable waters in accordance with procedures referenced in APHA Standard Method and laboratory standards for equipment and materials set forth by the U.S. Environmental Protection Agency.