We are in FL, so we don't drain any water for closing. We have a solid winter cover on and a leaf net cover over that. We need to maintain the water level so that we can run the pump during nights when it does freeze. But what is happening is that water soaks through the winter cover and evaporates faster than any kind of evaporation I usually get in the summer months. I am losing like 4 inches of water a week and constantly have to top off to ensure I have enough water to run the pump if it freezes. Anyone else ever have this problem? I don't remember it happening before, so maybe my winter cover has reached the end of its lifespan?