Does water leak out of pool skimmer?

here is how I did it - I built a box out of wood big enough to cover the skimmer area . I built mine out of scrap wood. I then covered the edges of the box with foam window seal to give it a good seal. Place the box over the skimmer area. When you start you will only lose the water inside the box and the water pressure will seal the area. Replace skimmer, remove box.