I have had my pool a couple of years but have never seen anything quite like what I saw today. I've had my pool covered for a couple of days with my solar cover on and the creepy crawly inside (but not running). Today when I took the cover off there's a weird "greasy" looking white film covering the top of the pool. My chemicals were all reading fairly normal but I did turn on the filter to run it through and see if I can get rid of it. The filter was just backwashed so it can't be that. Any ideas???