I'm wondering where I might find more information about how a high water level damages the pool (I have an in-ground vinyl pool), if I have properly blown and plugged the lines.
I don't have a submersible pump but I do have a main drain. The issue is though that the valves to turn off the skimmers are very stiff and cannot fully close. So as soon as I drop the water level below the skimmer, the pump loses prime. I think last season when the pool company came to close, they also just lowered the water level to below the skimmer (and still above the returns). The water level when opening the pool this past spring was above the skimmer, but I'm not sure the highest level it reached over the winter.