Using the Volta U1850, U1851 Cyclone Cone Filter is easy. First, make sure your Volta Lite II U1850 or U1851 model is turned off. Then, carefully open the cyclone dust catcher and place the cone assembly inside. That's it! When it comes to maintenance, check the filter regularly, especially after heavy use. If it's dirty, you can clean it gently with a soft brush. Be careful not to discard this part with the dust by mistake. With proper care, this filter will serve you well for a long time.