We have a VERY hot summer in PA, and I"m losing about 1/4" per night in my pool--for what I assume to be evaporation. I have a solar cover--but the stairs are open/uncovered--and all the water on top of the cover is gone by the next morning, so that is why I'm assuming evaporation. Also my pool is heated, and the nights are cool(ish), like around 65-degrees. Is this relatively typical?