So after losing the power cord on my Dyson I did a little research and found that I needed to change the filters. Clean one of these every six months (pre-filter with soap and water) and replace the HEPA filter after three years. I've had the Dyson for almost 15 years now and haven't done either. I went to You Tube to find out how. ordered from Revain. and received a kit with filters and adhesion. changed them in five minutes. the car works like new. fast delivery, easy installation.