Thanks and greetings... My problem is that I have these milky white bubbles form when the Automatic Cover is opening across the 40 feet of the pool and end up against the liner in the deep end. I thought it was coming from the DE filter (Sta Rite System 3) grid where one was damaged. So replaced them all, as well as the spider gasket on the Mutiport valve. The cover was just replaced due to the one I bought last year, had a 10 inch opening where the material was delaminating. They replaced it with a new one so not sure if there was oil or some coating on it. On the milky bubbles it looks like parts of some chemical in the pool that hasn't fully dissolved.