Opening an In-Ground Swimming Pool Opening your in-ground swimming pool is not as hard as it looks. By following this simple guide, you will look like a professional pool attendant and save money too. Since most pools in the Wisconsin area are closed with a cover for approximately seven months out of the year, you must start by removing the pool cover. To remove the pool cover, you should drain off any standing water or debris that may have accumulated on the cover over the winter. The easiest way to remove the water is with a small drain p ....