Abstract: In an HVAC system, an apparatus and method cleanses glycol-containing heat transfer fluid from the HVAC system in a batch process. Heat transfer liquid is admitted to the apparatus from a low pressure side of the system. The heat transfer fluid is filtered in a batch process and returned to a high pressure side of the HVAC system.

Abstract: In an HVAC system, an apparatus and method cleanses glycol-containing heat transfer fluid from the HVAC system in a batch process. Heat transfer liquid is admitted to the apparatus from a low pressure side of the system. The heat transfer fluid is filtered in a batch process and returned to a high pressure side of the HVAC system.

Abstract: An aqueous parts cleaning apparatus includes a base defining a liquid-containing volume and a basin sized to be received upon an upper end of said base. The basin has a drain disposed to empty into the volume. A pump is provided for pumping liquid into the basin from the base. A heater is provided for heating liquid within the base. An oil skimming weir is provided for skimming oil off the surface of the solution within the base. A second oil skimming weir is provided for skimming oil from solution contained within said basin.

Abstract: A method and apparatus are disclosed for cleansing a used autombobile anti-freeze solution. The method and apparatus include pre-filtering a used solution with a particulate filter selected to filter contaminant sized greater than a predetermined minimum size. An ultrafiltration membrane filter is provided. The ultrafiltration filter has a semi-permeable membrane separating a concentrate portion from a permeate portion. The pre-filtered solution is passed to the concentrate portion and the permeate portion is connected to a storage tank. Additives are provided for replenishing filtered constituents.

Abstract: An apparatus is disclosed for cleansing an aliphatic hydrocarbon solvent of an oil based contaminant. The apparatus includes a source of a contaminated solvent and an ultrafiltration filter having a semi-permeable membrane with a pore size selected to pass molecules of the solvent through the membrane and restrict passage through the membrane of molecules of the contaminant. A water cooled jacket is provided for maintaining the temperature of the solvent in the apparatus below a flash point. Pressure switches are provided for maintaining the pressure at the inlet of the ultrafiltration filter below a predetermined maximum to protect the filter. Concentrate of the ultrafiltration filter is recirculated to the source of the contaminated solvent.