Thanks Janet! I really appreciate the info. I've got the tabs in the skimmer, pump running constantly (my chlorine based on my OTO test 5+ and pH was 7.8). The water is looking slightly better already, but it looks a little slimy/filmy on top (hard to describe). I can't wait to get that DE and give it a whirl! I'll update as soon as I find out about the filter or if they're are any changes. Again, thanks so much! You guys are awesome!