I have a situation that was described on a previously abandoned thread that never produced a good solution. I have owned a home with an inground pool in the desert of CA for 2 years. I have not filled my pool once this summer and the water level remains the same or rises - - no cracks in the plaster - no leaks in the fill valve - not sure where the water comes from. Can someone tell me if this theory is plausible- since it is hot during the day and cool at night the pool releases heat at night and gets cold. During the next day, humid hot air hits the cold pool surface and cools down. When the humid hot air cools, it no longer has the capacity to hold so much water so condensation forms, filling the pool. Is that crazy?