Pool build complete late Feb. Immediate wetspot near skimmers and main drain. Here we are in October... still no root cause. We've had 3 leak detections. Plumbers. Geologist. Irrigation. All don't seem to find the source of the water. We all thought water table, but geologist found none. Pressure is good. We have an autofill, spa, and gutters are tied into drainage. My guess is it has something to do with whatever is not under pressure. Have 4th leak detection this week and they are bringing out listening devices.