After adding a skimmer the pool started to leak. Even on hot days we see water on the ground in one area which is opposite the skimmer. Never prior. Yet I see no obvious signs of leaking anywhere. Im going to try the dye leak detection however I am curious, is there such a thing as leaking witing the layers of vinyl? Im thinking if I do not see any water from the outside the leak must be on the bottom somewhere....thoughts? Thanks.