Hi, I have an inground pool made on concrete with gunite( I think) that seems to be losing a lot of water. It is about 18x36, 22,000 gallons in the San Francisco Bay Area. Air temperature has been between 85-95 degrees during the days and about 65 at night. It is often windy. Pool is covered each night. I lost 1 inch of water over 5 days. Is it possible to evaporate that fast or could there be a leak in one of the underground lines? There are no visible leaks on the surface. Pool used daily. Any ideas? Thanks!