PoolSystems Water-Wand Cartridge Filter Cleaner CWS186 Unique, world first hand-held cartridge filter cleaner. Makes cartridge cleaning quick and easy. This patent pending device drastically reduces the time, effort and mess involved in cleaning cartridges. Eight fingers and 8 fan nozzles open and clean 8 pleats at one time. No Splash Back. Improved on/off switch & hose connection.