The Polysep™ II media consists of a borosilicate glass layer and a layer of mixed esters of cellulose membrane. The depth of the microfiber filter layer provides high particle loading capacity, and retention of large particulates while maintaining high flow rates. The mixed cellulose ester membrane layer provides the high retention needed during critical prefiltration steps while protecting more expensive downstream filtration devices and equipment. Polysep II filters are available in four pore sizes, and multiple configurations that vary by filtration area and the type of connection.