The Katadyn filter also costs about $60 and I'm not sure that you can backflush one. They have a semi-porous membrane surrounding the filter that is cheap and easy tp replace. They catch a lot of sediment and therefore extend the life of the filter.
I have a Katadyn Base Camp filter. They're famous for plugging up. You have to have the filter in place to use the bag so I cut one off just above the bottom plastic. Then I put a Sawyer in the line below the bag. It filters 3x as fast and is easy to unplug.
