I have just had a new vinyl liner installed. The installer located a well point that I was unaware of (two previous installers didn’t even mention such a device). It is not a large diameter pipe that will fit a sub pump. It is a 1.5” unthreaded PVC that was capped and was a few inches below the lawn. It is currently connected to what looks to be a standard 1.5 HP pool pump that belongs to the installer. I’d like to know what would be a good pump to buy to move the ground water when necessary. I don’t know how far below the pool structure these generally go, but I have right around 10’ between the deepest point and the deck.