I fortunately had an underwater patch kit that I applied to the leak after I discovered it and it appears to be holding for now. This happened last night and the pool is still holding water this morning so that is good right. My concern now is should I do anything else or is there anything else I can do? Where the hole was there is a circular depression about the size of a normal soup bowl. The flow through the hole was obviously getting progressively worse as the sand was being washed out from under the liner and I feel if I had not been swimming for the first time this year that I would not have discovered it and who knows what would have happened if left to run it coarse.
I now have a patch applied that appears to be holding but it is applied in this bowl like depression where the sand washed out. The hole was close to the edge where the sand is built up in the wedge at the wall and the bottom of the pool is about 1-1/2 feet below grade at that location. I am wondering if I should dig down by the outside of the pool and try to somehow force some sand back under there to fill or raise the depression back up or what? Anyone been there done that before? What should I do next?