Filtering unit having separately attachable filter cassette, filter cassette, and method of filtering

摘要

A filtering unit (10) including an upper container (12) for receiving fluid to be filtered, a lower container (16) for receiving the fluid from the upper container (12) and an intermediate filter cassette (22). The filter cassette (22) includes a support member (30) connected with a flat filter member (32), such as a membrane filter, and can be removed with respect to each of the upper and lower containers (12, 16). The filter cassette (22) may be inserted within the upper container (12) with sealing engagement between the support member (30) and the internal wall of the upper container (12). The various disclosed embodiments include the ability to serially connect multiple filter cassettes generally between the liquid contained in the upper container (12) and the lower container (16).