Abstract: An ultrasonic cleaning apparatus (10) and method for use with a cleaning solution for cleaning soiled items, such as automobile parts. The cleaning apparatus includes a cleaning tank (11) for containing a quantity of the cleaning solution therein, with the cleaning tank having a bottom and a top. An ultrasonic generator (17, 18, 122) is provided for ultrasonically exciting the cleaning solution contained within the tank. The tank includes an upper drain (32, 33 or weir 200) and a lower drain (21). A coalescing filter (14) is used for filtering the cleaning solution. A sump tank (12) provides an extra quantity of the cleaning solution for at times overfilling the tank to draw off light ends of oils and greases from the top of the tank. At other times, the lower drain is used to draw off heavy ends of greases and oils from the bottom of the tank.

Abstract: A rechargeable filter assembly for removal of contaminants from liquids of all types, particularly dry cleaning solvents comprising three nested and spaced apart concentric perforated metal cylinders defining an inner cavity and an outer cavity held in spatial relationship by a base plate and removable lid. With the lid and outer perforated cylinder (exterior shell) removed, a removable and disposable filter unit may be placed within the outer cavity and similar, or different, filter medium may be placed within the inner cavity. The gaskets of the filter unit in conjunction with the lid, the base, the conduit, exterior shell and the inner perforated cylinder provide seals which prevent liquids from bypassing the filter unit.