I just purchased a home with a DE filter and I know very little about them. I'm used to a basic Hayward 1200 cartridge filter and am thinking of getting rid of the DE and replacing with cartridge and here's why... when the mutivalve is on Filter the water pressure comes to a crawl. When switched to recirculate it's GREAT. I've taken out the DE fins and cleaned them and it seemed to work great for about a day. After that, back down to low pressure again. I didn't even put DE back in it after I cleaned it so I would think the fins would be clogged already. That said, do the fins go bad with age? I don't see any rips or tears in any of them and I hate to spend a couple hundred bucks on fins when I can get a cartridge filter for about that and solve all the problem, or so I think... basically, I need some advice on whether or not to replace the DE system with a cartridge filter and why. Can someone please help?