http://www.poolforum.com/pf2/showthread.php?t=5423

This link shows what kind of gook I'm filtering up. I'm not sure if it's from the filter or is just dead algae, but my heart tells me it's from the filter.

Last year on my DE filter, it was an algae free summer other than a few SMALL outbreaks. This year, the only thing that changed is the new sand filter and my pool just plain sucks. Still using bleach and borax and all the numbers are fine just like last year.