I've had my pool/home a few years. Opened it up this year just fine. No leaks or issues. About a month into running everything I started to notice I would wake up and my pool had pumped below the skimmer thus running my pump dry (my main drain at the bottom was eliminated by the previous owner so only have one skimmer for sucking). Basically I've discovered my water level drops significantly but only when the pump is running. If I fill it to the top of the skimmer box its about to the minimum (running dry) after running for 8-10 hours.
I have a leak detection company coming out to help diagnose the leak next week to the tune of $500 minimum. Wondering if there is anything I can do myself to help find it myself? No water is coming through my concrete when the pump is running. Outside of losing a lot of water I see no signs of a leak. Basically I'm just trying to minimize the damage I'm about to receive. My buddy is a plumber by trade and had no idea how you would do it without fancy sonar equipment. Even then I'll still have to bust out the concrete and dig down and fix the repair.
My liner (concrete pool vinyl liner) was brand new when I moved in (3 years ago) so I don't think that's leaking but its possible. It's only when I run the pump does it actually drop beyond evaporation levels. So I'm thinking return jets or possibly skimmer line. Again can't see anything that would indicate its coming up somewhere.
Just throwing myself at your mercy. Wondering if anyone has dealt with this and can give me some advice? I just keep seeing ending up demo'ing my fence to get a mini back hoe into my back yard to dig it all up and seeing the bill rising with each little bit.