I was checking for a video that shows the inside of the filter. Mine seems to be degrading inside. I have only cleaned it once, today. It really doesn't have to much hard use. I have used it for a wet vac a few times, but it is mostly used for cleaning out cars.
Anyway..........this video shows a guy giving a demo of cleaning the filter. He used air. My compressor died so I took the shower head off in the basement shower and used a water stream to clean mine. Looking at the video, air would have done the job much faster. It took a really long time using water.
Anyway................This guy does a demo of how to clean the filter, and then he replaces it with a new one. Wonder what he is going to do with the filter he cleaned? :o)