Relatives use our pool a lot and slab on the sunscreen. Banana Boat for the kids which I can't blame them but.... I lift the skimmer cover and clean out the black gunk all inside the skimmer which is like auto grease. I really don't care for that gunk and I use Natural Chemistry Pool Perfect to no avail.
It's sickening to see that black gunk and I wonder what it does to my pipes and filters. Anybody know of a brand that won't do this. I know it is the sunscreen as when the kids don't use the pool I don't get the black gunk. Thanks