In Arcadia area of Phoenix to clean up a Hayward Pro-Grid DE filter yesterday. The pool pump was making noise and filter tank pressure was up. The before and after on the video are pretty amazing. Check it out.
These pool filters are pretty common. I have serviced them in Scottsdale, Peoria and Anthem as well. Having seen so many I can tell you preventative maintenance is a must. If the filters get too dirty the fabric can tear.