I leave my cover on when the pool is not in use and run the pump at night in these hot temperatures. The water is well over 100 degrees in the top layer under the cover. Is this bad for the liner? The water showed 108 after circulating for about 10 minutes, 20 minutes after that it was 92. I don't want to circulate the hot water during the day unless there is a potential of ruining the cover and/or liner.