There are 3 different filters on this particular model. Two of them are foam, and as washable, the 3rd is a HEPA filter that's located on the back and is not washable, but needs to be replaced once a year.
The most important filter, and the one that most people are not even aware of, is located directly underneath of the dirt cup. Directly under the dirt cup you'll see a black tray that says "pull". Pull this tray out, and you'll find a square shaped washable filter. Simply remove this filter and rinse it under water until it's clean. Make sure to let the filter completely air dry before reinstalling it in the vacuum and using the vacuum again.
The second foam filter is located directly above the dirt cup. Remove the dirt cup, and in the clear plastic housing that's directly above the dirt cup you'll find a circular colored plastic piece. Reach your hand up there, and unscrew this plastic part while pulling downward. You'll find a circular shaped filter that wraps around this plastic piece. This filter may also be washed the same way as the square shaped one, again just make sure that the filter is completely dry before using the vacuum again.
The HEPA filter is actually on the back of the vacuum in a grate that pull down to open it and remove it. This filter needs to be replaced only, and can not get wet.
The foam filters can be washed several times, but will sooner or later need to be replaced, as they will start to deteriorate after a few washings.
If you need to purchase these filters, here are direct links to all of the filters on your vacuum cleaner.
Square Shaped Pre-Motor Filter Bissell Part 203-1073 Circular Shaped Bissell Upper Tank Filter 2031085
Pre-filter Lift Off Series
Bissell Style 8 & 14 HEPA Media Post Motor Filter Part 3091
Here's a link to the parts diagram for your model also, this will help you locate the 3 filters.
Also, here's the link to the owners manual for your model as well:
I hope this helps you,