First, test your filter with D.E. Slowly add 1/2 cup of D.E. to the skimmer while watching the return. If you see white or cloudy stuff coming back through the returns, you may hve a filter problem.

If you don't see stuff coming back, read this thread. http://pool9.net/de-test/

You may be able to get D.E. @ WalMart http://www.walmart.com/ip/HTH-D.E-Fi...10-lb/20434370 Description is correct, PICTURE is WRONG.