There is a post-motor HEPA filter located on the bottom of the unit which should be cleaned approximately every 12 months. To remove this, you will need to fully recline the vacuum body to access the HEPA cartridge. You can also remove the floor nozzle by pressing the red nozzle release button on the side of the unit. Next, turn the latch to the unlock symbol, remove the bottom cover and press the button to release the filter frame. To wash, put under tap water until the water runs clean, then let air dry completely for at least 24 hours. Once dry, replace the HEPA filter back into your vacuum and secure the cover on the bottom of the vacuum.