I just bought a home with a vinyl liner pool. I quickly found that the pool has a leak and drops about an inch a day. Through initial trial and error, I found that the water loss is seemingly non existent when I utilize the floor drain only. Additionally, I saw no apparent correlation to the use of different return lines.
The pool guy came out yesterday and pressure tested the skimmer lines by plugging one (there are two total) and applying pressure to the other. I saw the pressure slowly drop, and did hear a pretty distinct gurgling with his geophones at the likely spot in the concrete where the two skimmer lines join the line to the pump.
My confusion is that from my reading online it sounds like a suction side leak shouldn't lose water when the pump is running and yet that is exactly what I'm seeing.