I finally replaced the original filter in my Eureka Power Plus 4703 F-1 vacuum cleaner that I have had for several years. I didn't realize the importance of changing the filter at least every year because I figured it was time to replace my vacuum cleaner. I just vacuumed with a new filter and it has made a huge difference and works just as well as it did when new. The doubles are great too. I will definitely buy them again if I need them.