NilfiskCFM Polyester anti-static compressed air cleaned cartridge filter 780mm
These are usually in a set of 4 or 3 and the price is for EACH cartridge. Fitted to CFM 3907/18C780 3PH IVAC Cartridge Filter Vacuum Cleaner
The module fits on the top section of the dust container with the 24V control unit and air distributor, fed by a 6 bar supply of compressed air.
I've seen these filters used on machines in foundrys, mills and up north in the Pilbara, and they are always clean and the suction is always constant. They are FAR, FAR AND AWAY BETTER than the electric filter shaker method.
At the moment, as delivery is FREE Australia wide, maximise the saving on postage and buy some of the related parts below, such as dustbags and a new hose, or a new floor tool and some other accessory!