AZTEK Cleaning Station Filters. Refills for the Airbrush Cleaning Station #9315. When your filter becomes totally discolored it is time for a new filter. To replace filters, unscrew feed pipe. Next, unscrew outer ring and remove old filter. Drain jar if necessary. (Dispose of waste liquids responsibly. Check and follow local regulations for responsible disposal of waste liquids.) Place new filter on the jar and reinstall feed pipe. Lastly, screw down outer ring. Your Airbrush Cleaning Station is now ready for use.