Shark Navigator Upright uses one HEPA filter in front of the vacuum and two foam filters for additional filtration. To clean the HEPA fillter, lift the door from the bottom, take it out, and wash it. Foam filters are located under the canister. Remove them both and wash those too. Filters require manual washing in cold water without any detergents or bleach. Also, make sure filters are completely dry before putting them back on the vacuum. Extra filters can be purchased on Amazon or other websites.