So, I'm still battling algae. I thought I was finished, was going to vacuum tonight and be done and clear, but the stuff on the bottom that I thought was dead was not. It barely came up with the vacuum. I had to scrub, and I mean scrub hard, to get this stuff up. And when I did, it became these dark green, almost black pieces of nastiness floating in the water. Now I have a pool full of that junk. Back to slamming I go! Has anyone else ever seen algae like that?