Yeah, I KNEW there had to be a good reason! I'm still getting my water clear, mostly there and holding FC well. A little cloudy but that's clearing. Next weekend I hook up the solar panels, carry up the solar cover and start warming the water. But when it's full of birch flowers and other stuff, and the water looks like algae green jello, I don't want that stuff clogging my solar panels or all over my solar cover.