Looking for some advice on adding DE to my sand filter. I've been slamming for about 2 weeks. FC is holding pretty steady at this point and CC has been 0 for a week. Water has not cleared up though. I deep cleaned the sand and yesterday afternoon decided to add a little DE to help speed up the process. My pressure gauge sits in between 12 and 13 psi after a backwash so I added enough DE to raise pressure to 14. It stayed at 14 for about ten minutes so I went inside. Came back out 20 minutes later to check, so 30 minutes after adding DE, and pressure had risen to 24! I backwashed out immediately and have not added more DE. Did the addition just catch that much junk in 30 minutes or did I do something wrong?