From the inner cyclone, the air will move about through a washable inner foam pre filter where a majority of the particles will remain trapped. This feature helps the DC15 to keep dirt and debris trapped inside and out of the motor. The last step in the system after moving through the motor is the trip through the final HEPA filter. The DC15 has a very strict filter system, which will prevent 99.9% of bacteria and mold from getting to your home. The vacuum will suck it up and keep it inside of the vacuum where it belongs. Even though they aren't very well known, Dyson has been around for many years. They aren't as popular or as well known as the bigger companies such as Hoover, although they offer you great quality and performance with their vacuum cleaners. Unlike Hoover, Dyson works to improve on their own products as well as the competition with each product they release.
The Dyson DC15 is also known for its suction power and attachments as well. With the ball assembly, using attachments are a breeze. The only problem you may have, is getting the hang of things. The attachment wand is stored inside of the handle of the vacuum and is always attached. To use it, you lock the handle in the upright position then push a button on the front of the handle that will allow you to telescope the wand for use.

