A little help or advice would appreciated. We have a 18 by 36 inground vinyl liner pool.
We are losing about 1.5 inches of water a day and this is with the pump not running. I have plugged all return jets,suction ports and skimmer so there is no outlet for the water. The swimming pool light has been plugged where cable goes through the niche and new gasket put around it. The water is already below skimmer so that rules out the skimmer. Before the water got below the skimmer I went ahead and put new gasket around skimmer plate. There are no obvious seam tears. I have checked around the pool steps to make sure that all screws are tight and have dye tested all places that ports come through the vinyl liner including pool light. I have got out at the pool at night with high powered hand held lantern trying to find some little hole or tear but with no success. The temperature right now is about 65 degrees during the day. Does anyone have any experience with this type of leak. Any help would surely be appreciated. This amount of water equals about a thousand gallons of water a day.