I would ask CoverStar why the holes are there. I don't see any reason to have them.
The pool water should be kept at normal level, not below the skimmer. See below from CoverStar manual.
I think that the back wall where the cover goes over is probably not smooth and is scratching the cover.
Feel along the wall at the front and back edges through the cover to see if you can feel anything sharp or pointy.
The pool water should be kept at normal level, not below the skimmer. See below from CoverStar manual.
I think that the back wall where the cover goes over is probably not smooth and is scratching the cover.
Feel along the wall at the front and back edges through the cover to see if you can feel anything sharp or pointy.
During the winter the proper water level must be maintained as the water supports the ice and snowmelt build-up. The best method is to blow out the lines and use filter plugs & cover plates so that the water level does not have to be lowered. (If the pool has tile, which might be damaged by freezing, lower the water level to 1 inch below the tile).
A cover should only be used as a winter cover if it has the proper slack. Proper slack is determined
by where the cover touches the water. When the water level is lowered, the cover should normally
touch the water no more that 12 inches from the edge of the pool. Actual slack requirements may
vary depending on local conditions.