Hi Joe and Sandy, Holes are usually caused by the pool cleaner. Hand vacuums can leave holes all around the outer edge. These will usually leak the most water. They will be located at the top of the cove and look like small black dashes. A very small tear in the cove can leak a lot of water.

The other type of cleaner caused holes are much harder to find. They are pin holes in the bottom, usually in the location the cleaner spends to much time being lazy. The only way to find them is to go under the liner and look for daylight. Very often I see the milky way doing this.

I would start by taking a close look at the cove area, where the cove meets the wall. If you can find the hole, or holes and patch them you will not have to drain any more water out of the pool.

Best of luck, Dennis