A packet communication system of this invention includes a user access device at a user point for providing a user with connectivity to a plurality of carriers, carrier communication networks linked to the user access device, and a carrier management network which controls and manages the user access device and communication devices. The table includes table base and a table top. The base, filter and filter frame are all affixed to the camera board by fasteners. The casing carrying the memory chips has a terminal unit at the end insertable in the host equipment. The accumulated solid material acts as a secondary filter by pre-filtering the liquid prior to contact with the ultra-filtration filters.