Film on top of water after opening Auto Cover every night

[Justin1Ntime]

Hi, I am at a loss. The swimming pool store has not been much help so I thought I would try here in a last ditch effort to get help. I have a 17000 gallon fiberglass pool with a UV system and an autocover. When I cover the pool for the night and pull the autocover back there is this translucent film on the water. Its not everywhere but there is enough of it to ask myself WTF is that floating on the water. The more I open and close the cover the more film I see on the surface. I have made sure it wasnt sunscreen or any oils like that. If I leave the cover open the film does not appear. If I leave cover open for a few weeks then close it for the one night it still leaves a very very very small amount of film on the water almost unnoticeable. I really had to look. Then if I start using the cover regularly again the film comes back. I am at the point where I dont want to use the autocover any more. My water is balanced and crystal clear. I have a picture of the film but I cant see a place to post the picture. I tried dumping oxidizer in per the pool store. I have lowered my Phos. One night out of frustration and anger, I dumped 3 pounds of shock in and closed the cover right away and the film was gone for a full week but I cant keep closing the cover when I shock the pool. I guess that is a No No. One day I closed the cover as much as I can and jumped in the pool got underneath it and brushed it. Honestly when I look under the cover it looks fine. I dont see mold or anything. I dont know what else to do. Has anybody else had this issue with their pool cover and water?

[Denniswiseman]

What do the manufacturers of the pool cover say, as it seems related to it

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[Golfer1]

I have the exact same issue and no one can figure it out! Do you have an answer yet?

[Teapot1]

Plasticiser out of the pvc off gassing?
I was at a trade fair the other week and there were lots of air monitors there. Mainly on the VOC's because there were fresh carpets etc on the stands VOC's hit the top of the scales for most vendors, all plastic products off gassing, a bit concerning

[Cabanagirl1738]

I know it’s been a while since the original post was made but I am having the same problem. Any ideas for how to clean/treat underside of pool cover? I can get my water looking perfect but after using auto pool cover there is a translucent film on top of the water. I have shocked the pool and used alkalinity up. I’m at a loss.