Rectangular filters, assembly and method for filtration

A filter assembly for filtering liquids, comprising:

• a) a filter housing;
• b) a liquid inlet to the filter housing;
• c) a separation plate sealably secured to the inner circumference of the filter housing, wherein said separation plate has a plurality of openings and a plurality of perforated supports mounted thereon corresponding to each of the openings;
• d) a plurality of rectangular shaped filters of pleated filter media enclosed in said filter housing mounted above the separation plate, wherein each of said rectangular shaped filters having a central void surrounded by the inner surface of pleated filter media, a solid top cap, a bottom cap having an opening located therein corresponding to the central void of said rectangular shaped filters to communicate with the central void in the filter media, wherein each of the central voids that extends from the solid top cap to the bottom cap of the rectangular shaped filter surrounds each of the perforated supports extending from the separation plate;
• e) the bottom cap of each said rectangular shaped filter is removably mounted on the separation plate with a sealing member that avoids liquid bypass, wherein the separation plate having the openings to correspond to the openings in the bottom caps, wherein such that a liquid to be filtered passes from external surface of the pleated filter media into the central void of the rectangular shaped filters and becomes filtered clean liquid, and the filtered clean liquid passes through the openings on the bottom caps into the corresponding openings in the separation plate;
• f) a chamber that is provided in the filter housing below the separation plate to collect the filtered clean liquid;
• and
• g) a clean liquid outlet from the filter housing beneath the separation plate.